Outlook clients crashing after Exchange 2010 upgrade

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We recently upgraded from Exchange 2007 sp2 and we are experiencing problems with Outlook. All users were functioning properly prior to their mailboxes being moved to Exchange 2010. Users with office 2007 receive Rundll, EMSMDB32.dll, and MSVCR80.dll errors. Users with Office 2010 receive ntdll.dll error. Examples below:
Windows 7 with Office 2010:
Faulting application name: OUTLOOK.EXE, version: 14.0.4536.1000, time stamp: 0x4af1d69e
Faulting module name: ntdll.dll, version: 6.1.7600.16385, time stamp: 0x4a5be02b
Exception code: 0xc0000374
Fault offset: 0x00000000000c6cd2
Faulting process id: 0xd30
Faulting application start time: 0x01ca8d7ec8760eb4
Faulting application path: C:\Program Files\Microsoft Office\Office14\OUTLOOK.EXE
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Windows Vista with Office 2007:
Faulting application name: OUTLOOK.EXE, version: 12.0.6514.5000, time stamp: 0x4a89dc70
Faulting module name: MSVCR80.dll, version: 8.0.50727.4927, time stamp: 0x4a2752ff
Exception code: 0xc0000005
Fault offset: 0x0001500a
Faulting process id: 0x1090
Faulting application start time: 0x01ca8282a22948b8
Faulting application path: C:\Program Files (x86)\Microsoft Office\Office12\OUTLOOK.EXE
Faulting module path: C:\Windows\WinSxS\x86_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.4927_none_d08a205e442db5b5\MSVCR80.dll
Report Id: eb00a1fd-ee75-11de-8fc5-00a0d5ffff85
Current Server Environment:
MailServer04 - Windows Server 2008 R2 - Exchange 2010 Update Rollup 1 - Client Access Role, Hub Transport Role
MailServer05 - Windows Server 2008 R2 - Exchange 2020 Update Rollup 1 - Mailbox Server Role
DC02 - Windows Server 2008 R2 - Domain Level is Windows Server 2008 R2
DC03 - Windows Server 2008 R2
Client Computers:
Problems experienced all accross the board which would lead me to believe the problem is with the server. Clients are Vista with office 2007, Vista with office 2010, Windows 7 with office 2007 and Windows 7 with office 2010. Problems experienced on computers that have existing working profiles as well as clean installations. Problems experienced with mailboxes moved from 2007 as well as newly created accounts in Exchange 2010. They also range between standard user accounts and Exchange Admin accounts. All users have administrative rights on their local computers.
Plenty of users are still functioning and they range between Exchange/Domain admins and standard users running the same range of client OS/Office installations.
The upgrade was done by installing the new Exchange 2010 servers on new Windows Server 2008 R2 servers. The client access\hub transport server was done first. Both roles were then transitioned to the new servers. The mailbox server was done last. When all mailboxes were moved to the new server the old was uninstalled. Both servers were uninstalled by running the setup and checking the roles to be removed.
Other notes:
- Since users did not use public folders, no public folder database was created in Exchange 2010
- The Exchange 2007 servers were decommissioned a day after roles were moved to their 2010 replacement. This probably was not long enough to allow a proper transition time, but it is what it is.
- ExBPA does not report any problems
- I've tried moving the users to a new mailbox database and that has not helped.
- Opening Outlook in Safe Mode does not change the outcome.
- All users can use OWA and smart phones without any problems.
Any help is greatly appreciated


A quick update to this....
I tried a couple additional steps with two of the user accounts that are broken. The first thing i did was export the mailbox, delete the user account, recreate the user account and import their mail database. Outlook still crashed when opened. The second thing i tried was to delete the account and reassociate the users mailbox with their new account. That did not help either.


Some questions:

1. Does OWA work for those account?

2. Have you tried a fresh Outlook profile?

3. Has anything messed with their default proxy settings (run proxycfg.exe)?
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