MSIMN.EXE is a tiny (59 kb) launcher program. It hasn't changed in
almost 4 years.
MSOE.DLL is the guts of the program. It's about 1.2 MB and is what
changes most often when OE is updated.
If you do Help, About Outlook Express it will list the various DLL files
used by OE and there versions (build numbers).
Mike - http://www.yqcomputer.com/