I was upgrading Windows 2003 box to 2008 today before we hit the 2003 suppot End of life
We encounterd a problem with powershell version installed not letting me to upgrade and another issue with Front page server extentions
Microsot solution for Powershell was rather complex and I came across rather a simple solution of renaming the Powershell folder in Widnows\System32 folder.
Forntpage issue resolved deleting the registry entry for below.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\Web Server Extensions\5.0\Setup Packages “Microsoft Windows” =””