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Exchange 2003 duplicate calendars after moving mailbox to new Server

Our Exchange 2003 server is having some resource issues... easy enough fix, brought up a new exchange 2003 box set up all the connectors (i think) and then moved about 10 users to new box... now the users who are on the new box have 2 calendars items in outlook.

I Have found that moving a user back to the original server fixes the issue. so what am not doing right when moving the mail box to the new server to get rid of the old calendar?
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Tony J
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Thanks for the quick response! I followed the guide and skipped the steps to remove the other server because I want these servers to exist together. I have more info to add...

1. Origional server = server 2003 sp2 with exchange standard sp2 --- new server = server 2003 r2 with exchange enterprise sp2
not sure if this makes a difference but thought it would be good to point out.

2. everything is working correctly except calendar's
a. when i add a persons calendar that has been migrated to the new server i get 2 calendar items and they stick in the view pane beside my calendar until i switch to mail then back to calendars again.
b. most users on the new server can not be added because users get error messages...
c. the double calendar items show as one local calendar and the other is a shared calendar... the shared calendar is the calendar that actually works..

Frustrated... I think it is permission related or some simple step I/we missed

Help...
Out of interest, do the duplicate calendar items appear in OWA or just Outlook?

There are a couple of Technet articles on duplicate calendar entries:

http://support.microsoft.com/kb/911131
http://support.microsoft.com/kb/890436

It might be worthwhile checking you have all the updates and rollups on both servers.

On point 2b - can you post the actual error message they get?

On point 2c - the following article discusses the correct Exchange 2003 permissions:

http://technet.microsoft.com/en-us/library/aa998446%28EXCHG.65%29.aspx
It might also be worthwhile reviewing the event logs on each server and running the Exchange Best Practices Analyzer tool.

A version compatible with Exchange 2003 can be downloaded here:

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=dbab201f-4bee-4943-ac22-e2ddbd258df3&displaylang=en

Although I'm not certain if that's the most up-to-date version, you can update it from within itself once run.
It also turns out that for what ever reason the duplicate calendar went away after restarting the machines... I did not try that because restarting a machine to fix an outlook problem seems sort of silly but none the less it worked...