I have a user who has outlook 2010 sp1 connected to an exchange 2003 sp2 small business server.
The user has access to multiple shared calendars (around 10). Periodically the user loses the ability to add new appointments to the calendars, the option is not available anymore. Remove and readd calendar gives the ability to put items in the calendar again. Re-opening outlook has the same affect.
Whilst the option to add a new appointment is not available I can logon to the owa and add an item successfully into the shared calendar.
The user has full mailbox access to the user account of the affected calendars and also the default for the calendar sharing is publishing editor.
The outlook profile is in cached mode but isnt in cached mode for shared folders ie to download caches of shared calendars.
So far it seems this user is the only one affected but unable to see any differences between her outlook settings and others that dont have the issue.
Unable to see this as a permission issue as the user has the ability to add items to shared calendars again once closing/reopening outlook or removing re adding the shared calendar