That's a problem with Free/Busy on Public Folders...
See this: http://support.microsoft.com/kb/284200
Best regards

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Nicolas Buache
MCSE, MCSA, MCP, APS
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>I recently migrated from Exchange 5.5 to Exchange 2000 with some minor
> issues. One that I currently am trying to resolve is the Free/Busy
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>
> DMKanz