My environment is mixed Exchange 2003 and Exchange 2010 SP1 update 5. I have a number of users that access a public folder calendar by adding it to their public folder favorites which then adds it to their Outlook 2010 Other Calendars.
Beginning last week these users started reporting that the public folder calendars are starting to disappear from Other Calendars. If they go to their public folder favorites and click on the public folder calendar it seems to add it back in to Other Calendars.
Any ideas why they started to disappear?
