MobileMe is the new service from Apple to replace their .Mac online service for Macintosh users. Launched with the new iPhone to much fanfare, it may well represent Apple’s most painful product introduction. It seems Apple underestimated the demand on the service when the new iPhone was launched, and existing .Mac users were switched across. For some users this caused a 2 week period of intermittent outages. Personally, I found that things were working within about 48 hours, and given the scale of the transition, I felt this was acceptable. Apple has given all users an extra month free as compensation.