Mac OS X Snow Leopard explained

Mac OS X 10.6 Snow Leopard
Version Of:macOS
Developer:Apple Inc.
Source Model:Closed, with open source components
License:Commercial software license and Apple Public Source License (APSL)
Kernel Type:Hybrid (XNU)
Updatemodel:Apple Software Update
Supported Platforms:IA-32, x86-64[1]
Release Version:10.6.8 v1.1 (Build 10K549)
Release Date:[2]
Ga Date:[3]
Preceded By:Mac OS X 10.5 Leopard
Succeeded By:OS X Lion
Tagline:The world's most advanced operating system. Finely tuned.
Support Status:Historical, unsupported as of February 25, 2014. iTunes is no longer supported as of September 2014 and Safari support is terminated as well,[4] though the last security update happened in September 2013.[5] [6] An update for the Mac App Store on Mac OS X Snow Leopard was released on January 27, 2016.[7] [8]

Mac OS X Snow Leopard (version 10.6) (also referred to as OS X Snow Leopard[9]) is the seventh major release of macOS, Apple's desktop and server operating system for Macintosh computers.

Snow Leopard was publicly unveiled on June 8, 2009 at Apple’s Worldwide Developers Conference. On August 28, 2009, it was released worldwide,[3] and was made available for purchase from Apple's website and retail stores at the price of US$29 for a single-user license. As a result of the low price, initial sales of Snow Leopard were significantly higher than that of its predecessors whose price started at US$129.[10] The release of Snow Leopard came nearly two years after the launch of Mac OS X Leopard, the second longest time span between successive Mac OS X releases (the time span between Tiger and Leopard was the longest).

The goals of Snow Leopard were improved performance, greater efficiency and the reduction of its overall memory footprint, unlike previous versions of Mac OS X which focused more on new features. Apple famously marketed Snow Leopard as having "zero new features".[11] Its name signified its goal to be a refinement of the previous OS X version, Leopard.[12] Much of the software in Mac OS X was extensively rewritten for this release in order to take full advantage of modern Macintosh hardware and software technologies (64-bit, Cocoa, etc.). New programming frameworks, such as OpenCL, were created, allowing software developers to use graphics cards in their applications. It was also the first Mac OS release since System 7.1.1 to not support Macs using PowerPC processors, as Apple dropped support for them and focused on Intel-based products. As support for Rosetta was dropped in Mac OS X Lion, Snow Leopard is the last version of Mac OS X that is able to run PowerPC-only applications.

Snow Leopard was succeeded by OS X Lion (version 10.7) on July 20, 2011.[13] For several years, Apple continued to sell Snow Leopard at its online store for the benefit of users that required Snow Leopard in order to upgrade to later versions of OS X. Snow Leopard was the last version of Mac OS X to be distributed primarily through optical disc, as all further releases were mainly distributed through the Mac App Store introduced in the Snow Leopard 10.6.6 update.[14]

Snow Leopard is the last version of Mac OS X that supports the 32-bit Intel Core Solo and Intel Core Duo CPUs. Because of this, Snow Leopard still remained somewhat popular alongside OS X Lion, despite its lack of continued support,[15] mostly because of its ability to run PowerPC-based applications.

Snow Leopard is also the last release of Mac OS X to ship with a welcome video at first boot after installation.[16] Reception of Snow Leopard was positive; see the section below.

System requirements

Apple states the following basic Snow Leopard system requirements are:

Additional requirements to use certain features:[17]

Snow Leopard drops support for PowerPC-based Macs (e.g., Power Macs, PowerBooks, iBooks, iMacs (G4 and G5), all eMacs, plus pre-February 2006 Mac Minis and the Power Mac G4 Cube), although PowerPC applications are supported via Rosetta, which is now an optional install. In 2020, two developer previews of Snow Leopard that are universal appeared on the Internet that can be booted on select G4 and G5 Power Macs with modification and patching.[18]

License

Snow Leopard is available as an upgrade for Intel-based Macintosh computers. Single-user licenses and "family pack" licenses for up to five computers are available. For qualifying Mac computers bought after June 8, 2009, Apple offered a discounted price through its "up-to-date" program, provided that customers' orders were faxed or postmarked by December 26, 2009. The standalone retail version of Snow Leopard is marketed as being restricted to users of Mac OS X Leopard, while the recommended upgrade path from Apple for Mac OS X Tiger is through the "Mac Box Set", which includes Mac OS X Snow Leopard and the current versions of iLife and iWork.

There are three licenses available.[19] These licenses differ in their requirements for pre-installed versions of Mac OS X:

If you have purchased an Upgrade for Mac OS X Leopard license, then subject to the terms and conditions of this License, you are granted a limited non-exclusive license to install, use and run one (1) copy of the Apple Software on a single Apple-branded computer as long as that computer has a properly licensed copy of Mac OS X Leopard already installed on it.[20]

A "Family Pack Upgrade for Mac OS X Leopard" license is also mentioned as a subset of the Leopard Upgrade.

Subject to the terms and conditions of this License ... you are granted a limited non-exclusive license to install, use and run one (1) copy of the Apple Software on a single Apple-branded computer at a time.

It is not entirely clear which license is offered with the retail version of Snow Leopard. As noted above, Apple's website advertised this version as an "upgrade from Mac OS X Leopard for $29" and suggest that others upgrade using the Mac Box Set, implying the stand-alone retail version to be a "Leopard Upgrade" license. On the other hand, some Apple press materials appear to indicate that this version is, in fact, the "Single Use" license:

The Snow Leopard single user license will be available for a suggested retail price of $29 (US)[21] (emphasis added)

However, even if the retail edition of Snow Leopard is in fact a "Leopard Upgrade", the company has acknowledged that there is no technical barrier in that edition preventing a direct upgrade from Mac OS X "Tiger".[22]

The Leopard Upgrade license explicitly applies to the Up-To-Date Program[23] (US$9.95) for Macs bought between June 8 and December 26, 2009[24] and the installation discs provided through this program are clearly marked as upgrades unlike either of the retail editions.

New or changed features

Mac OS X Snow Leopard is a release that refined the existing feature set, expanded the technological capabilities of the operating system, and improved application efficiency. Many of the changes involve how the system works in the background and are not intended to be seen by the user. For example, the Finder application was completely rewritten in the Cocoa application programming interface, from its previous Carbon codebase.[25] Despite significant changes in the software, users will experience almost no changes in the user interface. Snow Leopard includes the following changes:

Refinements to the user interface

While the Finder was completely rewritten in Cocoa, it did not receive a major user interface overhaul. Instead, the interface has been modified in several areas to promote ease of use. These changes include:

New wallpapers

As with most upgrades of Mac OS X, new wallpapers are available. There are new wallpapers in the Nature (two of which are of snow leopards), Plants and Black and White sub-folders under the Apple folder. Furthermore, there are new Apple wallpaper sub-folders with multiple wallpapers:

New solid colors can be used as wallpapers as well. There is a new blue and gray, as well as a solid kelp which serves as the "green wallpaper." The default "space nebula" wallpaper has been updated as well.

Removed features

Developer technologies

64-bit architecture

Mac OS X Tiger added limited support for 64-bit applications on machines with 64-bit processors; Leopard extended the support for 64-bit applications to include applications using most of Mac OS X's libraries and frameworks.

In Snow Leopard, most built-in applications have been rebuilt to use the 64-bit x86-64 architecture (excluding iTunes, Front Row, Grapher and DVD Player applications).[41] They will run in 32-bit mode on machines with 32-bit processors, and in 64-bit mode on machines with 64-bit processors.

In addition, the Mac OS X kernel has been rebuilt to run in 64-bit mode on some machines. On those machines, Snow Leopard supports up to 16 terabytes of RAM. Newer Xserve and Mac Pro machines will run a 64-bit kernel by default; newer iMac and MacBook Pro machines can run a 64-bit kernel, but will not do so by default.[42] Users wishing to use the 64-bit kernel on those machines must hold down the numbers 6 and 4 on the keyboard while booting to get the 64-bit kernel to load.[43] [44] A change to the com.apple.Boot.plist will also enable users with compatible computers to permanently boot into 64-bit for those wishing to do so.

Stuart Harris, software product marketing manager at Apple Australia, said, "For the most part, everything that they experience on the Mac, from the 64-bit point of view, the applications, the operating system, is all going to be 64-bit, but that at this stage there were very few things, such as device drivers, that required 64-bit mode at the kernel level".[44]

With Mac OS X Snow Leopard only the following Apple computers run or are capable of running the 64-bit kernel:[45]

ProductModel identifierK64 status on client versionK64 status on server version
Xserve early 2008 and laterXserve2,1 and higherCapableDefault
Mac Pro early 2008MacPro3,1
Mac Pro early 2009MacPro4,1
Mac Pro mid-2010MacPro5,1
MacBook Pro early 2008MacBookPro4,1Capable
MacBook Pro late 2008MacBookPro4,1 and 5,1
MacBook Pro early 2009MacBookPro5,2
MacBook Pro mid-2009MacBookPro5,3 and 5,4 and 5,5
MacBook Pro mid-2010MacBookPro6,1 and 6,2 and 7,1
MacBook Pro early 2011MacBookPro8,1 and 8,2 and 8,3Default
iMac early 2006 and lateriMac4,1 and higherCapableCapable
Mac Mini mid-2010Macmini4,1Default
Mac Mini mid-2011Macmini5,1Capable [46]

Amit Singh has reported that the early 2009 Mac Mini and MacBook may be capable of running the 64-bit kernel; however, Apple has set these models to boot into the 32-bit kernel. With some tweaking, the Unibody MacBook can be set to boot the 64-bit kernel.[47]

Grand Central Dispatch

Grand Central Dispatch (GCD) uses the multiple processor cores now in every new Macintosh for more efficient performance. Due to the complexity of multithreaded programming and technical difficulties traditionally involved in making applications optimized for multicore CPUs, the majority of computer applications do not effectively use multiple processor cores.[48] As a result, additional processing power, compared to single-core machines, often goes unused. Grand Central Dispatch includes APIs to help programmers efficiently use these cores for parallel programming.

Grand Central Dispatch abstracts the notion of threads away, and instead provides developers with the concept of queues—lists of jobs (blocks of code) that need to be executed. GCD takes the responsibility of distributing the jobs among actual threads and cores, and clearing up unused memory created by inactive or old threads to achieve maximum performance. Apple is also releasing APIs for Grand Central Dispatch for developers to use in their applications and also to analyze specific blocks of code running on Grand Central Dispatch.[49]

A new C and Objective-C language feature named "Blocks" facilitates creation of code that will easily optimize to take advantage of Grand Central Dispatch.[50] [51] [52]

OpenCL

OpenCL (Open Computing Language) addresses the power of graphics processing units (GPUs) to leverage them in any application, and not just for graphics-intensive applications like 3D games. OpenCL automatically optimizes for the kind of graphics processor in the Mac, adjusting itself to the available processing power. OpenCL provides consistent numeric precision and accuracy, fixing a problem that has hampered GPU-based programming in the past.

OpenCL includes a C-based programming language with a structure that is already familiar to Mac OS X programmers, who can use Xcode developer tools to adapt their programs to work with OpenCL. Only the most process intensive parts of the application need to be written in OpenCL C without affecting the rest of the code. OpenCL is an open standard that has been supported by AMD, Intel, and Nvidia; it is maintained by Khronos Group.[28]

It serves a similar purpose to Nvidia's C for CUDA and Microsoft's Direct3D 11 compute shaders.

It only works with the following Mac GPUs: NVIDIA GeForce 320M, GT 330M, 9400M, 9600M GT, 8600M GT, GT 120, GT 130, GTX 285, 8800 GT, 8800 GS, Quadro FX 4800, FX 5600 and ATI Radeon HD 4670, HD 4850, HD 4870, HD 5670, HD 5750, HD 5770, HD 5870, HD 6490M, HD 6750M, HD 6770M, HD 6970M.[17] If the system does not possess one of these compatible GPUs, OpenCL code will instead execute on the system's CPU.[53]

CUPS

CUPS (the printing system used in many Unix-like operating systems) has been updated to version 1.4 which provides improved driver, networking, and Kerberos support along with performance improvements. CUPS 1.4 is also the first implementation of the Internet Printing Protocol version 2.1.[54]

Power management

Power management has been improved, with implementation of a new wake on demand feature supported on more recent Macintosh hardware.[55] Wake on demand takes advantage of the sleep proxy service implemented in AirPort and Time Capsule routers,[56] so that the computer can sleep while the router responds to mDNS queries. Should the request require the host computer to wake up, the router sends the necessary special wake-up-packet[57] to the sleeping computer.

Security

Apple strengthened Mac OS X by implementing stack protection, and sandboxing more Mac OS X components such as the H.264 decoder in QuickTime and browser plug-ins as a separate process in Safari.[58] Secure virtual memory was an option in earlier releases on Snow Leopard, but the checkbox to disable it was removed later. An anti-malware feature was also added to the system that alerts the user if malware is detected. Mac OS X 10.6.8 added regular malware definition updates.

Computer security researcher Charlie Miller claims that OS X Snow Leopard is more vulnerable to attack than Microsoft Windows for lacking full address space layout randomization (ASLR) since Mac OS X Leopard,[59] a technology that Microsoft started implementing in Windows Vista.[60]

The Safari web browser has received updates to version 6.0 in Lion and Mountain Lion, but not in Snow Leopard.

Compatibility

Snow Leopard breaks compatibility with several older versions of some applications, such as Parallels Desktop 3.0, versions of Aperture before 2.1.1, and versions of Keynote before 2.0.2, among other software.[61] Apple has also published a list of applications with known compatibility issues with Snow Leopard.[62]

Printer and scanner drivers used by previous versions of Mac OS X are not compatible with Snow Leopard and will be replaced during Snow Leopard installation. Since the initial release of Snow Leopard many manufacturers have provided compatible drivers that are available via Software Update.[63] If a native driver is not available Snow Leopard also includes CUPS and Gutenprint open source drivers that may provide limited functionality.

10.6.0 introduced a bug that frequently prevented DNS queries from returning IPv6 addresses.[64] [65] [66] This was resolved in 10.6.8.[67]

Reception

At the WWDC in 2009, Apple stated that Snow Leopard features no new major visual changes.[68] Instead, the release focuses on refining the operating system to enable better performance.

OSNews reported that Mac OS X Snow Leopard was well received by critics.[69] [70]

Engadget reviewed Snow Leopard and pointed out that the price of Snow Leopard dropped from the $129 Apple charged for previous versions of Mac OS X to $29. Engadget's opinion was that this could be largely because most users would not see a noticeable change in the look and feel of the system.[71] However, most reviews commented on the large improvement in speed of the native Mac OS X applications Finder, iCal, Mail, etc.

CNET editors gave it 4 stars out of 5, stating "Intel Mac users will like Snow Leopard's smartly designed interface enhancements, and its Exchange support is a must-have (especially with Outlook for Mac on the way). With a ton of technological improvements, Snow Leopard is worth the $29 upgrade fee."[72]

On October 21, 2009, SFGate blogger Yobie Benjamin wrote that the "MacBook Pro that came preloaded with Snow Leopard kicks butt and is a screaming fast machine", but "when I tried to upgrade one of my 'older' MacBooks, it was a fricking disaster from hell". Apart from upgrading, Benjamin also tried a clean install. But he complained of slowness even after his clean install. He wrote, "I ended up downgrading back to OSX 10.5.8" then he concluded by writing, "I might try to do it again but it won't be till Apple releases at least 2 major fix updates. If you want to roll the dice and try, go ahead... your upgrade might work, however, random installs not working is not good for me. Lesson learned --- I'll wait."[73]

The single-user upgrade and Family Pack units of Snow Leopard ranked 1 and 2 respectively on Amazon.com's software bestseller charts when Apple announced it would release it within the week.[74]

Testmac.com highlighted other unexpected improvements including the release of a new version of Boot Camp, version 3.0, a cleaner, popup software update process and screen and video recording in the new QuickTime Player.[75]

The BBC reported that a bug in Mac OS X versions 10.6.0 and 10.6.1 which, in rare cases, caused loss of user account data after use of a previously existing guest account by users who had upgraded from a previous version of Mac OS X, received wide publicity.[76] The bug was fixed as of version 10.6.2.[77]

Release history

Former Apple CEO Steve Jobs announced Snow Leopard at WWDC on June 9, 2008,[78] and it was privately demonstrated to developers by Senior Vice President of Software Engineering Bertrand Serlet. On Monday, May 11, 2009, after build 10A354, Apple issued a code freeze on Snow Leopard's APIs.[79] The first public demonstration was given at WWDC 2009 by Serlet and Vice President of Mac OS Engineering, Craig Federighi.[78] [80]

VersionBuild[81] DateDarwin versionNotesDownload
style=text-align:center rowspan=2 10.610A432August 28, 200910.0Original retail DVD releaserowspan=2
10A433Server edition; Original retail DVD release
style=text-align:center 10.6.110B504September 10, 200910.1About the Mac OS X v10.6.1 UpdateMac OS X v10.6.1 Update
style=text-align:center 10.6.210C540November 9, 200910.2About the Mac OS X v10.6.2 UpdateMac OS X v10.6.2 UpdateMac OS X v10.6.2 Combo Update
style=text-align:center rowspan=3 10.6.310D573March 29, 201010.3About the Mac OS X v10.6.3 UpdateMac OS X v10.6.3 Update
10D575April 1, 2010Second retail DVD release
10D578April 13, 2010About the Mac OS X v10.6.3 Update; v1.1Mac OS X v10.6.3 v1.1 Update (Combo)
style=text-align:center 10.6.410F569June 15, 201010.4About the Mac OS X v10.6.4 UpdateMac OS X v10.6.4 UpdateMac OS X v10.6.4 Update (Combo)
style=text-align:center 10.6.510H574November 10, 201010.5About the Mac OS X v10.6.5 UpdateMac OS X v10.6.5 UpdateMac OS X v10.6.5 Update (Combo)
style=text-align:center 10.6.610J567January 6, 201110.6About the Mac OS X v10.6.6 UpdateMac OS X v10.6.6 UpdateMac OS X v10.6.6 Update (Combo)
style=text-align:center rowspan=3 10.6.710J869March 21, 201110.7About the Mac OS X v10.6.7 UpdateMac OS X v10.6.7 UpdateMac OS X v10.6.7 Update (Combo)
10J3250For the early 2011 Macbook ProMac OS X v10.6.7 Update for early 2011 MacBook Pro
10J4138May 4, 2011For the early 2011 Macbook ProMacBook Pro Software Update 1.4
style=text-align:center rowspan=2 10.6.810K540June 23, 201110.8About the Mac OS X v10.6.8 UpdateMac OS X v10.6.8 Update (Combo)
10K549July 25, 2011About the Mac OS X v10.6.8 Update; v1.1Mac OS X v10.6.8 Update v.1.1Mac OS X v10.6.8 v1.1 Update (Combo)

Mac OS X Server includes these features and other server-related features. Apple initially stated that Server would include ZFS support, but mention of this feature later disappeared from Apple's website and it was not included in the final release due to licensing issues.[82]

On January 27, 2016, Apple released an update for the Mac App Store on Mac OS X 10.6. The update was titled "Mac App Store Update for OS X Snow Leopard". The download was 3.5 MB.[7] [83]

See also

External links

Notes and References

  1. Web site: Mac OS X v10.6 Snow Leopard — Installation and Setup Guide. September 2009. Apple Inc.. October 7, 2020. November 27, 2020. https://web.archive.org/web/20201127111822/https://manuals.info.apple.com/MANUALS/1000/MA1172/en_US/Snow_Leopard_Installation_Instructions.pdf. live.
  2. Web site: Download Mac OS X 10.6.8 Update v.1.1. July 25, 2011. June 23, 2011. June 24, 2011. https://web.archive.org/web/20110624213203/http://support.apple.com/kb/DL1400. live.
  3. Apple to Ship Mac OS X Snow Leopard on August 28. August 24, 2008. Apple Inc.. January 11, 2018. December 9, 2019. https://web.archive.org/web/20191209130359/https://www.apple.com/newsroom/2009/08/24Apple-to-Ship-Mac-OS-X-Snow-Leopard-on-August-28/. live.
  4. Web site: iTunes 11.4 for OS X 10.6 . Apple Inc. . 28 July 2019 . 9 September 2014 . February 11, 2015 . https://web.archive.org/web/20150211120630/https://support.apple.com/kb/DL1774 . live .
  5. Web site: Security Update 2013-004 (Snow Leopard) . Apple Inc. . 28 July 2019 . 12 September 2013 . September 19, 2022 . https://web.archive.org/web/20220919181314/https://support.apple.com/kb/DL1678?locale=en_US . live .
  6. Web site: Apple retires Snow Leopard from support, leaves 1 in 5 Macs vulnerable to attacks . Keizer . Gregg . . February 26, 2014 . 2017-07-22 . live . https://web.archive.org/web/20140528150522/http://www.computerworld.com/s/article/9246609/Apple_retires_Snow_Leopard_from_support_leaves_1_in_5_Macs_vulnerable_to_attacks . May 28, 2014 . mdy-all .
  7. Web site: Mac App Store Update for OS X Snow Leopard . Apple Inc. . 28 July 2019 . 27 January 2016 . September 19, 2022 . https://web.archive.org/web/20220919181314/https://support.apple.com/kb/DL1860?locale=en_US . live .
  8. Web site: Apple updates Snow Leopard so you can continue to upgrade from Snow Leopard . Cunningham . Andrew . January 27, 2016 . . 2017-06-14 . live . https://web.archive.org/web/20170107044318/http://arstechnica.com/apple/2016/01/apple-updates-snow-leopard-so-you-can-continue-to-upgrade-from-snow-leopard/ . January 7, 2017 . mdy-all .
  9. Web site: Mac App Store Update for OS X Snow Leopard . Apple Inc. . 28 July 2019 . 27 January 2016 . September 19, 2022 . https://web.archive.org/web/20220919181314/https://support.apple.com/kb/DL1860?locale=en_US . live .
  10. Web site: Snow Leopard Leaps Out of the Gate: Sales for Latest Apple OS Far Exceed Prior Launches, According to NPD. NPD Group. September 17, 2009. May 7, 2010. March 26, 2010. https://web.archive.org/web/20100326164956/http://www.npd.com/press/releases/press_090917.html. dead.
  11. Web site: Mac OS X 10.6 Snow Leopard: the Ars Technica review. Siracusa. John. 2009-09-01. Ars Technica. en-us. 2019-10-15. July 13, 2014. https://web.archive.org/web/20140713115247/http://arstechnica.com/apple/2009/08/mac-os-x-10-6/. live.
  12. Web site: WWDC 2009 Keynote. Macworld. 2 December 2015. live. https://web.archive.org/web/20151208160557/http://www.macworld.com/article/1140897/keynote.html. December 8, 2015. mdy-all.
  13. Web site: Mac OS X Lion Available Today From the Mac App Store. Apple.com. Apple Inc.. July 20, 2011. live. https://web.archive.org/web/20110721232504/http://www.apple.com/pr/library/2011/07/20Mac-OS-X-Lion-Available-Today-From-the-Mac-App-Store.html. July 21, 2011. mdy-all.
  14. Web site: Upgrade to OS X Mavericks. Apple.com. Apple Inc.. November 5, 2013. If you’re running Leopard and would like to upgrade to OS X Mavericks, first you’ll need to upgrade to OS X Snow Leopard. You can purchase OS X Snow Leopard here.. dead. https://web.archive.org/web/20131105201919/http://www.apple.com/osx/how-to-upgrade/. November 5, 2013. mdy-all.
  15. News: The Rise and Fall of Mac OS X Versions, 2009 to 2015. 2015-10-04. Low End Mac. 2017-08-10. en-US. August 11, 2017. https://web.archive.org/web/20170811005457/http://lowendmac.com/2015/the-rise-and-fall-of-mac-os-x-versions-2009-to-2015/. live.
  16. Web site: Booting OS X Lion GM: No Welcome Video, New Introduction to Scrolling. MacRumors. July 2011 . en. 2020-04-18. August 4, 2020. https://web.archive.org/web/20200804005348/https://www.macrumors.com/2011/07/01/booting-os-x-lion-gm-no-welcome-video-new-introduction-to-scrolling/. live.
  17. Web site: Apple Inc. . Mac OS X Snow Leopard: Technical Specs . Apple Inc. . May 23, 2011 . dead . https://web.archive.org/web/20090831083420/http://www.apple.com/macosx/specs.html . August 31, 2009 . mdy-all .
  18. Web site: Snow Leopard on unsupported PPC machines . 2020-04-21 . . December 4, 2020 . November 15, 2020 . https://web.archive.org/web/20201115181051/https://forums.macrumors.com/threads/snow-leopard-on-unsupported-ppc-machines.2232031/ . live .
  19. Web site: EnglishLicense . February 22, 2010 . live . https://web.archive.org/web/20091122185613/http://images.apple.com/legal/sla/docs/macosx106.pdf . November 22, 2009 . mdy-all .
  20. Web site: Software license agreement for Mac OS X: Single Use, Family Pack and Leopard Upgrade Licenses for use on Apple-branded Systems. Apple Inc.. February 1, 2011. live. https://web.archive.org/web/20100922211812/http://images.apple.com/legal/sla/docs/macosx106.pdf. September 22, 2010. mdy-all.
  21. Apple Unveils Mac OS X Snow Leopard . Apple Inc. . June 8, 2009 . August 14, 2021 . August 14, 2021 . https://web.archive.org/web/20210814105003/https://www.apple.com/newsroom/2009/06/08Apple-Unveils-Mac-OS-X-Snow-Leopard/ . live .
  22. News: Apple Changes Leopard's Spots . . The Wall Street Journal . August 26, 2009 . August 27, 2009 . live . https://web.archive.org/web/20090828011250/http://ptech.allthingsd.com/20090826/apple-changes-leopards-spots/ . August 28, 2009 . mdy-all .
  23. Web site: Mac OS X Snow Leopard. . Apple Inc. . 2011 . February 8, 2011 . live . https://web.archive.org/web/20110213084539/http://www.apple.com/macosx/uptodate/ . February 13, 2011 . mdy-all .
  24. In the Up-To-Date Program terms and conditions, the 'upgrade' language is used: This program entitles the purchaser of a qualifying product purchased between June 8, 2009, and December 26, 2009, to upgrade to Mac OS X v10.6 Snow Leopard. Web site: Mac OS X Snow Leopard Up-to-Date Program. Apple Inc.. September 4, 2009. live. https://web.archive.org/web/20090830044713/http://www.apple.com/macosx/uptodate/. August 30, 2009. mdy-all.
  25. Web site: AI: 'Snow Leopard' to include rewritten Finder . October 17, 2008 .
  26. Web site: Reisinger. Don. January 6, 2011. Mac App Store launches on Snow Leopard. live. https://web.archive.org/web/20120810234859/http://news.cnet.com/8301-13506_3-20027548-17.html. August 10, 2012. CNET. CBS Interactive. mdy-all.
  27. Web site: Apple — Mac OS X Snow Leopard — Enhancements and Refinements. Multi-Touch gestures in older Mac models. All Mac notebooks with Multi-Touch trackpads now support three- and four-finger gestures.. live. https://web.archive.org/web/20090611013951/http://www.apple.com/macosx/refinements/enhancements-refinements.html#systempref. June 11, 2009. mdy-all.
  28. Web site: Mac OS X Snow Leopard . Apple Inc. . June 11, 2008 . dead . https://web.archive.org/web/20080720115100/http://www.apple.com/macosx/snowleopard/ . July 20, 2008 . mdy-all .
  29. Web site: Apple – Mac OS X – What is Mac OS X – Safari . https://web.archive.org/web/20110521134811/http://www.apple.com/macosx/what-is-macosx/safari.html . . October 22, 2009 . May 21, 2011 . October 22, 2009.
  30. Web site: Apple — Mac OS X — Universal Access. Apple Inc.. October 23, 2009. live. https://web.archive.org/web/20091027153017/http://www.apple.com/macosx/accessibility/. October 27, 2009. mdy-all.
  31. News: Katie . Marsal . Apple prepping new Snow Leopard, iWeb, ARD updates . Bits . AppleInsider . March 5, 2009 . April 13, 2009 . live . https://web.archive.org/web/20090416234048/http://www.appleinsider.com/articles/09/03/05/briefly_apple_prepping_new_snow_leopard_iweb_ard_updates.html . April 16, 2009 . mdy-all .
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  57. Note: The networking industry nomenclature for a wake-up-packet is Magic Packet
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