I know it's early in the game, but the sooner MS works this out the better I'd like to get the Exchange extensions back into the Remote Server Admin Tools (RSAT) console, supporting an Exchange 2003 Server. I've tried the "unsupported workaround" used in Vista (found at Using RSAT on Vista to Manage Exchange Attributes via ADUC), but no luck. After registering, when I try to view properties for a user or computer, the MMC just coughs up an error and hangs. I have to unregister the file(s) to get the RSAT ADUC working again. Secondly, MS eventually released a Vista-compatible version of Exchange System Manager for Exchange 2003, but it won't install under Windows 7 ("This program requires Windows Vista" is the error at the outset). I've tried right-clicking the installer and selecting W7's compatibility check, which attempts to disable the version check of the program, but again, no dice. So if anyone has gotten past these issues, or knows of an MS solution, please share the wealth!