According to quick google results WLCOMM is part of the Windows Live Messenger Contacts Server. It keeps your contacts info up to date and supposedly provides faster log-in speeds. My guess is it provides a base point for Windows Live contacts integration across different Microsoft software packages like Office and Internet Explorer. So if you added a contact in Outlook for example, that contact may be available in Live Messenger.

msnmsgr.exe is the live messenger application itself.
wlcomm.exe is the live services contacts manager

da: http://www.dslreports.com/forum/r220...and-msnmsgrexe