I have a dedicated NW5.1 SP7 running GW6.5SP2. Can I install Messenger v1
SP3 on the server when everyone is checking email. I have done it on a test
server (but only two email connections were made at that time) and I have
been mading changes to the test server and restarting the Messaging agent
modules without shutting down the GW modules and I don't see any crashes,
at least on the test server.

My plan is to install the Messenger module at the end of the day but have
GroupWise services up and running. Does anyone have any concern with the above?