Can't restore mail from Time Machine
We had a power failure last night and when I finally restarted my iMac, I found 99% of my Inbox was gone. When I attempted to restore it from Time Machine, I got the following notification:
"Mail" can't be modified or deleted because it's required by Mac OS X.
I have restored it before without this problem. I would appreciate any assistance.
MacBook Pro (15-inch 2.4/2.2 GHz), Mac OS X (10.7.2)