It was suggested that I post this question in the Exchange forum as well as the Outlook forum. We are having some issues with OL2010 not updating free\busy data properly against a EX2003 SP2 backend? Most of the time the data is accurate, however we have several users that occasionally notice that their free\busy information is not correct. Running /cleanfreebusy does not seem to fix the issue now that everyone is on OL2010. We have reduced the number of free\busy folder replicas to 1 per admin group as advised by MS, but it did not help. We have turned on Outlook logging and done captures with Time Travel Tracing which also did not help. It may be related to old recurring meetings that have one instance modified, but we have not confirmed this yet. Any suggestions would be appreciated. Update: The issue does seem to be related to old recurring meetings that were created with OL2003. Looking at the FB data with OL2010 some of these meetings are not visible. However, if you add user1 that is trying to view the FB data of user2 to user2's calendar as a reviewer, then the items appear normally. So at the moment the issue appears to be a rights problem with viewing FB data on old, recurring meetings after upgrading to OL2010.

This woudl be helpful 1) Increase Diagnostics logging for free/busy 2) Check with MFCmapi to see an ycorruption in the mailbox (only for prospective issue ones) 3) dump the permissions of the user for Ad-permission in powershell and compare with the workign one 4) Confirm replicas are configured properly

On 1 do you mean diagnostic logging for public folders? I have had this increased just to make sure there are no replication errors, etc.

Hi, Please try to export the meeting items from the problematic user's calendar temporarily, and create a testing meeting requset, then check whether the free/busy is working normal for the user. Thanks AllenAllen Song