Despite the service's formal activation yesterday, MobileMe customers are still having some problems accessing certain features. The problems began during the downtime for the transition between .Mac to MobileMe, which ended at 2 a.m. Thursday. As of now, however, access for many customers is still not fully functional.

Apple acknowledged the problems by posting a status update, it said:

“Transition is underway,” it is “taking longer than expected.”  Although some features are said to be working, like:

-Sync

-iDisk

-Back to My Mac

The service is not yet open to new users.