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Having trouble phasing out an old Exchange 5.5 server. Can you help?

We used to run purely Exchange 5.5.  We had two 5.5 servers and mailboxes were split between them.  Then we put in an Exchange 2003 machine, using Active Directory Connector to connect to the older 5.5 server running on NT4 (SP6a).  I started moving mailboxes over there ... eventually all of the mailboxes were off one of the 5.5 servers (we still have some mailboxes on the other 5.5 server).  I want to remove this server from our network, but it seems that everytime I turn it off people start complaining about Outlook features (speciafically Calendar items) not working correctly.  I crank up the old 5.5 server and the problems go away.  Any ideas?

This is a long shot (I'm not an Exchange guru), but would it have anything to do with the System Attendant on the old 5.5 server?  Or, maybe the fact the 5.5 server I'm trying to take offline was the original 5.5 server.  At any rate, I want to get this thing off my network.  Plus, I'm soon to have all the mailboxes on the new 2003 server and I'll want to remove the other 5.5 server at that time.  What could be the hangup?

I'm open to suggestions ... fire away.  If you need more detail please let me know.  Thanks.
1 Solution
It's not the System Attendant, but it is the fact that this was likley your first Exchange server, and as such, it houses many of the default system public folders, such as Free/Busy data.  You need to rehome those public folders, and then you can decommission the old server.  Check the following KB article for a description of the process.

griffisblessingAuthor Commented:
I think you hit it on the head with the moving of the Free/Busy folder.  As I recall, that was the specific error people were getting ... something about not being able to locate Free/Busy data.  I've moved the folders from the old 5.5 server to the new 2003 server.  Thanks for the great MS article.  Even if this isn't the exact answer you've given me a big push in the right direction.  So you get the points.  Thanks again.

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