This article is based around a quirky issue that I had little success in finding documented cases on, so I decided to do so here. Basically what seemed to be happening in our Exchange 2003 setup was that a few users had somehow come up with a secondary Exchange calendar. This calendar was named Calendar1 – and had become the default view both in Outlook 2007 and OWA.
The issue was that other users were inviting the user with the duplicate calendar issue and the entries were ending up on the calendar that was not visible. To make this even more complicated, on the users mobile device he could view the calendar that was not visible in his Outlook setup or OWA. All said and done it was a mess of duplicates. To clear this up I followed the steps below:
- Copy all entries from Calendar1 to Calendar by clicking the icon for a folder list in the navigation pane in Outlook, and setting the view to sort by Category. You can then highlight all the items listed and move them to Calendar.
- Now in my case, I could not remove Calendar1 (by right clicking and deleting) because Exchange saw that as a primary folder. Close Outlook, and start it back up using the run window – outlook.exe /resetfolders (KB292980)
- This resets Outlook to use the default folder structure and made the Calendar (not Calendar1) item the primary. I was no able to right click on the duplicate and remove it. You should also be able to do this for all other duplicate items (Junk, Notes, Tasks, etc..)
While I am unsure how and why this happened, we have reason to believe that it’s happening when a user meets their mailbox quota, and begins accepting invitations on their mobile device. The device then creates a secondary calendar which replaces the original as the primary, thus causing all kinds of issues with communication.
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