Apple’s .Mac service is down.
Users attempting to access .Mac are presented with a page stating:
This service is temporarily unavailable.
We’re working hard to restore normal service.
.Mac email services have been spotty today, but other .Mac features have been accessible from the website prior to this message being displayed.
[UPDATED: 4:04pm ET: .mac is back online with the message, “Members cannot access .Mac services. They will be restored ASAP.” Mail and “Back to My Mac” are currently indicated as being inaccessible to all or some .Mac members.]