Editing MacOS version history (section)

===Mac OS X 10.1 "Puma"===
[[Mac OS X 10.1]] (internally codenamed ''Puma'') was released on September 25, 2001.<ref>{{cite web
| title=Cross-Development
| url=https://developer.apple.com/documentation/DeveloperTools/Conceptual/cross_development/Using/chapter_3_section_4.html
| archive-url=https://web.archive.org/web/20070520203932/http://developer.apple.com/documentation/DeveloperTools/Conceptual/cross_development/Using/chapter_3_section_4.html
| archive-date=2007-05-20
| access-date=December 20, 2006
| date=November 11, 2006
| publisher=[[Apple Inc.|Apple]]
}}</ref>
It has better performance and provided missing features, such as DVD playback. Apple released 10.1 as a free upgrade CD for 10.0 users. Apple released a {{US$|129}} upgrade CD for [[Mac OS 9]].

On January 7, 2002, Apple announced that Mac OS X was to be the default operating system for all Macintosh products by the end of that month.<ref name="default os">{{cite press release
 |url          = https://www.apple.com/newsroom/2002/01/07Apple-Makes-Mac-OS-X-the-Default-Operating-System-on-All-Macs/
 |title        = Apple Makes Mac OS X the Default Operating System on All Macs
 |date         = January 7, 2002
 |access-date  = December 3, 2006
 |publisher    = [[Apple Inc.|Apple]]
 |archive-date = October 10, 2017
 |archive-url  = https://web.archive.org/web/20171010053540/https://www.apple.com/newsroom/2002/01/07Apple-Makes-Mac-OS-X-the-Default-Operating-System-on-All-Macs/
 |url-status   = live
}}</ref>