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1. Close Outlook
2. Select "Run..." from the Start menu
3. Type: outlook.exe /cleanfreebusy
4. Hit enter

Outlook maintains a hidden message called LocalFreeBusy in each calendar folder.  This message is only relevant to the mailbox owner and any delegates.

If a delegate user re-creates the LocalFreeBusy message, which is then not synchronized with the rest of the calendar data, an error message may occur stating “unable to open the free/busy...". The /cleanfreebusy switch recreates the LocalFreeBusy message to maintain integrity.