Yet another chapter in the tale of Microsoft products tied too tightly together...here comes the next fork lift...

Users planning to run Microsoft Exchange on Windows Server 2008 and those contemplating in-place upgrades of the new server operating system coming out next week may face installation problems unless they heed specific advice from Microsoft.

The vendor is already warning users that the RTM version of Exchange 2007 cannot be installed on Windows Server 2008 and that it is impossible to do an in-place upgrade to Windows Server 2008 on a server running Exchange 2007 SP1.

Microsoft also has said "rolling upgrades" of failover clusters for Exchange are impossible.  

Microsoft has published three migration options, including one long set of steps around off-loading data, uninstalling and reinstalling numerous Exchange components.
OK, let me get this straight.  We have to uninstall server applications, upgrade the server OS, and then reinstall those applications.  Is there a way to roll back the server upgrade and go back to previous state?  Words in brackets added by me:
Microsoft officials say in-place upgrades are not considered a best practice [for Microsoft products]  and that most large IT shops do thorough testing before deployment. ...

In addition, Hinrichs said Windows Server 2008 installs will likely [hopefully] be done on new hardware or hardware wiped clean for new installs.
Sounds like much fun.

Link: Network World: Windows Server 2008 potholes snag Exchange, in-place upgrades >

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