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Exchange 2003-2007 moving mailboxes & permissions

Our environment has many shared mailboxes, resource mailboxes, mailboxes opened as secondary (admins for execs, etc.).    I noticed that, when moving a shared mailbox from Exchange 2003 - 2007, the user who opens that mailbox as a secondary mailbox cannot access it until I set the mailbox permissions through the Exchange 2007 admin console.   I would have thought that these permissions were purely in AD.  Could someone shed some insight on this please?  This greatly complicates our mailbox migration plan as now we need to document each and every user that has a secondary mailbox and assign permissions immediately post-move.  
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MesthaCommented:
That shouldn't happen. The permissions should come across.
However do note that if you have shared mailboxes in place, and the primary mailbox is moved, Outlook will NOT update the location of the shared mailbox as well as the primary mailbox.
If you move the shared mailbox as well, then it will continue to work. Otherwise you have to remove the shared mailbox and then put it back in so that Outlook knows the shared mailbox is on another server.

Simon.
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44Author Commented:
Thanks Simon.   One strategy will be to move all mailboxes on each server over one weekend vs. 50 or so per night to limit this complication.  

For whatever reason, the permissions are not coming across and I need to set permissions through Exchange 2007 "manage full access permissions" if the primary mailbox is the one moved but secondary remains 2003.  

I've tested with just two mailboxes and moving simultaneously does preserve functionality.  Do you foresee any issues as long as we move all mailboxes over one weekend and these users do not access Outlook until Monday morning?
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MesthaCommented:
As long as both the old and the new server are available when the users come in, it shouldn't be a problem. I have moved 1000s of mailboxes, and have had at most a handful of issues. The few problems I have had were usually not caused by the mailbox move at all, but by a configuration error on the client and would have come out whether I moved 1 or 100 mailboxes.

Simon.
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44Author Commented:
Thanks for your suggestion.  We will try a mass migration over a weekend.  Moving all of them together I've encountered no issues with delegates, shared calendars, etc.   We will try to move 900 mailboxes over a weekend -- hopefully enough time with the high-end hardware and RAID 10 disk config we have.  
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