It is very cool application virtualization technology. Check out this post for details:
This is the first in what will be a series of posts from the team so be sure to subscribe to their feed. There is a lot of development in this area that I heard about two weeks ago at TechReady like further improvements to the core technology, sorting out some overlapping functionality with other products, and further integrating it with System Center.
I hadn't taken note of the market share numbers in a while but check out the results from the most recent Netcraft survey. They state the following:
"Microsoft continues to increase its web server market share, adding 2.6 million sites this month as Apache loses 991K hostnames. As a result, Windows improves its market share by 1.4% to 34.2%, while Apache slips by 1.7% to 48.4%. Microsoft's recent gains raise the prospect that Windows may soon challenge Apache's leadership position." ... "But if Microsoft continues to gain share at its current pace, it could close the gap on Apache sometime in 2008."
That is a substantial change especially considering that the percentages remained essentially stable through all of 2004 and 2005 with Apache leading by 30-40 points. Getting the gap down to 14 points is a significant achievment. Remember also that IIS used to be a toxic term in the late '90s and earlier this decade.
With the major improvements coming in IIS7 on Windows 2008, IIS may well become the leading web server platform in the very near future. That's a turn around that I don't think the team gets enough credit for.
Robert Larson has a good post on an issue that is cropping up quite a bit for folks upgrading to Virtual Server 2005 R2 SP1 who don't read the fine print of the release note :) The gist of it is make sure you shut down (not save state, actually shut down) your VMs before running the upgrade. The Save State functionality is not compatible between versions so you have to shut the VMs before you upgrade or they will not be able to start and you'll have to discard the saved state which could result in data loss.