I got up this morning and powered up my MBP. When I opened up my mail it had a little welcome screen telling me about the new features in this mail app. I then went in to check my mail and 4 of my accounts were gone and only my .mac account remained. That wasn't very nice. I was suspicious however and have been keeping an eye out for anyone else mentioning a new mail app. I thought maybe it was something to do with new iPhone or something. So anybody know what happened?

In about mail it says I have version 3.3 (924)