Calendar items disappear
Posted on 2006-05-04
Mail server is Windows 2000 SP4, Exchange is 2003 SP2, anti-threat and filtering software is Symantec Corporate Edition including the "for Exchange" module. We have a number of department/office calendars in the Public Folders area of Exchange. Editing and ownership permissions are limited to a couple people. Others in the department only view the calendar. Some use Outlook and some use OWA. Two departments have reported that calendar items have disappeared. These were entries for future dates - i.e., staff's scheduled summer vacation days, etc. There is no indication that the entries were manually deleted.
Through on-line research, I found information about file-level scanning and age limit settings. However, most of it refers to Exchange 2000 and the IFS drive mapping M:>. Exchange 2003 does not map this drive and I have verified that all of the Exchsrvr folders are excluded from Symantec virus scanning. I have a 90 day age limit set for the public folders because I want to only hold three months of past calendar data. MS KB821744 mentions how public folder age limits may affect system folders. The system folders in Exchange System Manager do not use the public store defaults and the Schedule+Free Busy has its own age limit of 100 days which conforms to the suggestion in this KB article that it be greater than what is set on the Public Folders.
Some of the items that disappeared were entered in January for summer months. Some of items that disappeared were entered recently for next month. All calendars are accessed and edited on almost a daily basis - or at least once a week. There are no messages in the server's Event Viewer reflecting any problems or erroneous activity in Exchange or the public store.
Any help in determining why these calendar items have disappeared and resolving this issue would be greatly appreciated.