ZDNet UK has observed that Microsoft has begun rolling out Windows 2008 internally. At present, 99.75% of servers hosting Microsoft.com have been converted to Windows 2008. Quoting the article:

“To deploy a new operating system and new web server into an environment like this without compromising performance or reliability is quite a feat,” Microsoft technical product manager Eric Woersching said on his blog.

For those interested in how Microsoft approached the switch, the company posted a 38-minute video with Woersching talking to two of Microsoft.com’s operations managers.