Upgrading iCal Calendars...

When I reboot my MacBook Pro running OS X Lion, iCal comes up and displays a dialog box saying "Upgrading iCal Calendars...". ". This window stays on forever and I finally force quit iCal and start iCal again. This time iCal starts up without any problems. Although this is not a major issue, I would like to get rid of this minor annoyance.
Following is the information relating to this problem:
iCal Version: 5.0.1 (1547.4)
OSX Version: 10.7.2
iCal connects to Microsoft Exchange Server at my place of employment. In addition it has three other personal calendars associated with my iPhone on it.
Any help would be great appreciated.
Thanks

I've had the same message ("Upgrading iCal calendars...") for over 24 hours now. It appears to be stuck at approx 75%. The prgress bar has not changed in 15 hours, but I do see CPU Time increasing, the CPU% changing and the # of threads changing (from 6 to 7 to 6, etc.).
How can I tell if it's really doing something?
What happens if I FORCE it out or reboot?
How long is too long to leave it be?
- John

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Quit iCal, paste this text ~/Library into the Finder>Go>Go to Folder...window and select "Go." This will open the Users Library Folder.
Then open the Preferences Folder in that Library Folder, and move the com.apple.iCal.plist file to the Desktop.
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jrObert,
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1. Disconnect your computer from your internet connection.
2. From the  Menu, select Force Quit...>Calendar.
3. Paste this text ~/Library into the Finder>Go>Go to Folder...window and select "Go." This will open the Users Library Folder.
4. Then open the Calendars Folder in that Library Folder, and move any any files with "Cache" listed in the name field to your Desktop.
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Hello:
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Upgrading iCal Calendars...

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