outlook 2007 calendar breaks with exchange 2010

We are running Exchange 2010 with about 40 Outlook 2007 clients.  calendar started out working fine for everyone (for about a week) but now two have stopped working.  They ran for many months without problem when attached to Exchange 2000.  when you click on the calendar, it does not come up at all, it causes outlook to restart with generic error "microsoft office outlook has encountered a problem and needs to close"  I tried the office diagnostics  (found nothing), ran a repair of office from control panel (didn't help) uninstalled/reinstalled office (didn't help). installed all Windows and Office patches (didn't help).
mmaggittiAsked:
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Michael B. SmithConnect With a Mentor Exchange & Active Directory ExpertCommented:
If OWA works fine, and creating a profile on your PC works fine, then I would be suspicious of the user's profile (Windows profile, not MAPI profile) on that PC. You might try deleting that and then recreating it all for the profile.
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George SasIT EngineerCommented:
Is this problem on ALL the client computers ?
Do you have any errors in the windows eventlog ? (on both client and server)
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Jamie GillespieSenior IT ConsultantCommented:
Try recreating the Outlook profile to test?
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Michael B. SmithExchange & Active Directory ExpertCommented:
Does Outlook Web App work OK? That's a key test.

I'd recommend trying each of the /clean* parameters identified here: http://office.microsoft.com/en-us/outlook-help/command-line-switches-for-microsoft-office-outlook-2007-HP001218589.aspx

If that doesn't help, create a new Outlook profile.

If that doesn't do it, let us know.

Michael
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mmaggittiAuthor Commented:
i created a new profile on the two affected PC's and it did not help.  When I bring up their profile on my unaffected PC the calendar works fine.  i will check some of the other suggestions
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mmaggittiAuthor Commented:
outlook web calendar works fine for all users
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mmaggittiAuthor Commented:
there is an error in event viewer
error.png
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mmaggittiAuthor Commented:
I will get back to work on this today
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mmaggittiAuthor Commented:
I found a trojan infection on the PC that I could not remove.  I plan on formatting the drive and starting over.
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