Windows Live Mail stopped working

I've been using Live Mail for a while now, all was well. Then suddenly today it stopped working, and I get an error that "Windows Live Mail has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available." The details from the Problem Report show the problem event as "APPCRASH", and the fault module is MSMAIL.DLL. Has this happened to anyone else? I have Vista Home Premium.
[489 byte] By [jayreynolds] at [2008-1-7]

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