Could Vista Be Fastest-Moving OS Ever?

After it's released early next year, Windows Vista could become the most quickly-adpoted operating system in history.

Citing automatic upgrades for Microsoft Software Assurance business customers and a record number of beta testers, an industry analyst has predicted that over 15% of computers in the world could be running MS Vista by the time the OS turns one year old.

From Ars Technica:

David Mitchell, who works for the marketing research firm Ovum, Ltd., believes that not only will Vista be a sales success for Microsoft, but that that as many as 15 percent of the computing world will be running some form of Vista within its first year of availability. This would make Vista the "fastest-moving operating system ever," according to Mitchell, surpassing the previous champion, Windows XP, which had 12 to 14 percent of Windows users switching within 12 months.

Jeremey Reimer, a writer at Ars Technica, continues with his own analysis of this possibility. He includes one very important piece of truth: with the computer purchase cycle down to about two years in the world's most developed nations, many Vista "upgrades" will be the result of consumers buying a new machine with the OS pre-installed.

Here's a question: What's the projected increase in Linux and Mac OS X users when Vista hits the 12 month mark?