Debian-exim showing as uid in ps output

In case you are wondering why you are seeing the uid instead of the username for Debian-exim:

106       6851  6343  0 16:28 ?        00:00:00 /usr/sbin/exim4 -bd -q30m

Here is the answer:
http://wiki.debian.org/PkgExim4UserFAQ#Whydoes.22ps.22displayExim.27saccountnameonlyasanumber.3F