when processing -MAPIStartup, turn the show ui flag off to put us in a semi server mode. then in the mapi
code we'll manually make sure the app doesn't exit after the last window goes away until
all the mapi sessions have logged off.
r=bienvenu
sr=sspitzer
git-svn-id: svn://10.0.0.236/branches/MOZILLA_0_9_4_BRANCH@104896 18797224-902f-48f8-a5cc-f745e15eee43