I have a weird issue and i don't know where to start.
We have about 20 mac users (out of 100 employees) in our company and are migrating via coexistence from exchange 2003 to exchange 2010 (sp 2 RU 8)
Normally the mac users grant read/write access to their department head so that the department head can schedule them for the week on specific tasks. It worked well in entourage 2008 with exchange 2003.
With Apple mail, some users are not able to grant read/write access to their calendar to the department head once the mailbox has been moved to exchange 2010. I can grant access for the department head to my domain/exchange 2010 account and grant read/write access in apple mail. The first mac user I moved over was able to grant read/ write access for their calendar.
The next two i moved to the new exchange server moved over fine and email and calendars show up fine. In Ical when i go to preferences - account - delegation - edit (" you can change who can access your account by clicking the edit button) and enter the name (which it finds in the directory) and apply read/write to calendars or task i get the following error message " The Server Responded with an error : ther was an unexpected error with the reques (domain EWSExchangeWebservicesErrorDomain/ error 94). Entourage 2008 EWS shows the same error message.
The only error i see is event 2915 MsExchange ADAccess user 'Side~domain\username~EWS~false' has gone over budget '327' times for component 'EWS" within a one minute period. Info "policy:DefaultThrottlingPolicy_xxxxxxxxxxx'. Threshold Value: '100'. which is received, i believe, when first adding the account to entourage or applemail
The users i'm having trouble with are relatively new to the company in the past year, and the other apple user i moved over has been here quite a few years, along with my account as well.
Domain/forest are native 2003 Exchange 2003 with latest sps and running on server 2003 sp2 (or latest) Exchange 2010 is running all roles on one server 2008 r2 fully patched.