Ok, I created a new account, then copied all files, one after the other, from the old account into the new one, overwriting the newly created blank files. Apart from the Inbox.snm file, which seems to be the corrupt one, it worked with all the rest. Amazing. And the Inbox.snm file doesn't even seem to be vital for the working of the program. Even more amazing.

But I guess I shouldn't be sarcastic and rather dance in joy. As far as it looks, all data's safe. Wheeee. I'll now do a backup.

And my head's still killing me, but at least my mood's improved. Yay.

edit: I lost five to ten entries; the first of the 54 new ones today since I accidentially killed them during the overwriting part. I don't even know what they were about. Sorry.