MobileMe has performance problems

In the last few hours, many users have reported that they have problems using certain functions of the MobileMe service owned by Apple. Some users claim that they cannot log in to the front page of me.com, others say that they cannot send emails from MobileMe at all, but for others there are no problems of this kind. Over the weekend there were problems with the iTunes activation servers and now the MobileMe servers seem to be causing some problems for some users. I don't have a MobileMe account, but I can access me.com without problems.

I know there are users among you who have MobileMe accounts, do you have any problems related to the functionality of the service? If so, how does it manifest itself?