Apple and Microsoft don’t usually play nicely together. Especially when it comes to hooking up an Exchange account on a Mac.
Try one or more of the following:
- Try deleting and adding your exchange account. This has fixed issues where the server rejected local changes.
- Turn off the account, close the apps and try the below, people have said this fixes a variety of issues for iCal:
- If you get the error similar to the following in iCal just try adding a new event.
SOAPWebServicesErrorDomain Code=-997 “The operation couldn’t be completed.”