No Free/Busy Information Could be Retrieved

We are having a problem viewing  the Free/Busy schedule of other users calendars when creating new a appointment.  This is something that used to work.  The error we receive is "No Free/Busy Information Could be Retrieved" when trying to view other users calendar schedule.  I am not aware of any time frame when it stopped working.
This is a child domain site  that we are browsing the calendars and viewing.  Attached is a screen shot.  Any help would be appreciated.

- Exchange 2003 SP1
- Windows Server 2003
- Outlook 2007 Client

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keproConnect With a Mentor Author Commented:
Needed to take up with MS there was some other work that was done to the Public Folder store that may be related to this.  
Try start Outlook with /cleanfreebusy switch. START > Run > Outlook.exe /cleanfreebusy
keproAuthor Commented:
Sorry, that was the first thing I tried.  I think this is more related to the Exchange server rather than the Outlook client.
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If your Outlook uses cached mode....try take that off for a bit and see if that is the cause
keproAuthor Commented:

Would you suggest taking off Cached mode on both client sides?

Yes, all that get this error should try take off cached mode. If it works after doing so, then re-create the OST-file or make a new Outlook profile.
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