Thanks to Microsoft's Dreamspark.com, I am running Server 2008 on one of my PCs. Although it works very well, I ran in to an issue when I tried to install the latest updates to Adobe Reader 9.
The updater gave a "Error 1625" message which is apparently due to UAC. According to AMC380 on the Adobe forums, you need only launch the Adobe Reader as admin (from the "Programs" folder) and then click "Help" and "Check for updates." After that, the update should go smoothly.