Very strange phenomenon noted at a recent ES 2010 upgrade. Client upgraded from SBS 2003 including Exchange Server 2003 to Windows Server 2008 R2 and Exchange Server 2010. Everything went well initially.
Now about 6 weeks out, and we have noted two instances where the singel shared public calendar has lost most of the entries. When it happened a couple of weeks back, we became aware of issu about one week after loss and so restored the backup public and exported to a .pst, and then created a second shared calendar as read-only for comparison with the main original. Also re-imported same into main again. Then, as of this morning, same thing happened where most fo the future and some past appointments are gone. Ran the EXFolders to un-delete and only found about 10 items, which were likely legitimate deletions...
Appreciate any help from specialists that really know ES 2010