Exchange 2013 User can't modify Shared Calendar after migrating to exchange 2013 from Exchange 2007

I have a user who was just migrated who gets and error about Microsoft Exchange not available when they attempt to open a Calendar Item to modify it. Was working before the move and the Calendar in Question is still housed on the old Exchange 2007 Server,
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dpcsitAsked:
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Simon Butler (Sembee)ConsultantCommented:
How are they accessing this calendar? Outlook doesn't cope well when two parts of a sharing process are migrated separately from each other. You will need to remove whatever method they are using to access the calendar and recreate the connection.

Simon.
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dpcsitAuthor Commented:
Tried my account on their browser and it worked fine no issues. I reset the browser to clear everything to see if that changes anything but at this point it appears to be related to their account somehow.
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Simon Butler (Sembee)ConsultantCommented:
Browser? Your tags don't say anything about a browser being involved, just Outlook. Therefore are you using Outlook or OWA?
Which revision of Exchange 2013 are you on? There are known coexistence issues with Exchange 2007 and CU6.

Simon.
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dpcsitAuthor Commented:
Opps got another ticket open wrong post to wrong ticket
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dpcsitAuthor Commented:
He deleted the Cals and added them back and still having issues. Doing Update 6 to see if this helps at all. Sorry for the confusion I created please ignore the browser post!
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dpcsitAuthor Commented:
Cals as in Calendars
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Satya PathakLead Technical ConsultantCommented:
To resolve this issue follow the below stesp.

This is a known issue ;

1) Remove a user permission of share calender and and readd the same.
2) Also try to remove the chached mode and try online mode .
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dpcsitAuthor Commented:
Did this just now (to many fires burning to deal with this until now) Also I found that he is a domain admin and that inheritance is reset for his account because of that. So could that be playing into this. The other DAs were added to the Calendar permissions separately and he was not.  Hope to know something tomorrow!
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dpcsitAuthor Commented:
Well tried your fix however it did not change the issues. The problem of all things was a network driver update he had done from MS updates that included a network driver newer then the Dell driver that is officially released. Once I reverted back to the latest dell driver the problem went away. One clue was the Calendar was very slow loading and it was popping errors about the exchange server not being available.

So lesson is never use drivers in a business environment that are not manufacturer drivers!

One other thing I found that did not help but might be of use was an article about disappearing permissions where inheritance was being reset on his account. The root issue was a phone syncing but I think it may apply to others attempting to move domain admins to a new exchange server since inheritance not being checked seems to be a show stopper in 2013.

http://redmondmag.com/articles/2010/03/01/disappearing-permissions.aspx?m=1
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dpcsitAuthor Commented:
Good info issue was resolved by changing the driver version for the network card.
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