MS Outlook 2010 / MS Exchange 2010 Default Calendar Issue

One of my users encountered the following problem today.

For an unknown reason, a second calendar has been created on his Exchange account, and set as default. After this happened, all new meeting invites sent to this user ended up on this new calendar. Under "My Calendars", I can see both the original calendar (which contains all appointments prior to today) and the new calendar which contains the appointments he received today.

I cannot delete the new calendar or rename it. When I right-click on it, options to delete or rename are grayed out.

Options to delete or rename the original calendar are available in the right-click menu.

I attempted exporting the original calendar and importing it into the new calendar, but instead the import process created a third calendar that contained all the past appointments for the user (it was basically a copy of the user's original calendar).

This is NOT a "personal" calendar that resides in a PST file. The user does not have a PST file. The new calendar also appears in the OWA, which leads me to believe this is a server-side issue.

This problem also causes the user's Android phone not to receive calendar updates.

Ideally I would like to either remove the new default calendar and designate the old calendar the default, but I don't see an option to do that. Barring that, I would like to import all the old events from the original calendar into the new default calendar, and delete the original calendar.

A valid backup of the user's mailbox is available, but I would like the restore to be the option of last resort.

I am running Exchange 2010, clustered.
The user is running Outlook 2010.

Assistance appreciated.
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didbaAuthor Commented:
Ended up doing the following:

0. Set the size limit for the Outgoing Mail for this user on the Exchange Server to 0KB.

1. Restored the calendar from a 2-day-old tape backup. This caused the old appointments to populate in  the "new" calendar (which was set as default and could not be deleted).

1a. Went in user's Outlook and deleted a massive number of NDRs that appeared as the result of Outlook trying to send out reminders about the old meetings that have been restored to the user's calendar.

1b. When NDRs stopped appearing, reset the Size Limit on the Exchange Server to a previous setting, so that the user could send email again.

2. Deleted all extra calendars that I created in process of troubleshooting, including the "original" calendar that lost its default status.

3. Deleted the RoamCache folder under Local Settings folder for Outlook, and restarted Outlook.

4. Removed the Touchdown profile on the user's Android phone, and recreated the Touchdown profile. This caused it to correctly sync the "new" calendar.
I cannot delete the new calendar or rename it. When I right-click on it, options to delete or rename are grayed out.
>> Did you make any changes / apply any RBAC / managed folders policy ?

Did you do any import / export / exmerge operations on the mailbox ?

What is easier for you > To create a new user and do a import / export
To troubleshoot this issue
didbaAuthor Commented:
No changes that I know of. The Exchange cluster has been stable. No changes client-side either, but he reported having some disk errors.

Export, kill user and import has been considered, it's the option of last resort. Would like to troubleshoot first.
didbaAuthor Commented:
"If you want something done right, do it yourself."
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