We upgraded from 6.0 to 7.0.1 groupwise this weekend and it was very smooth.
Tried to add in the Messenger 2.0, but the agent will not stay loaded. The
error we get is:

TCP Error starting TCP/IP agent [0xAE16] - DDC: Error with iterator setup

Nothing in knowledgebase and didn't see much on the forum. Any assistance
is appreciated. Holding up our groupwise client installs to do both at once.

Also, from looking at the forums, looks like the product might not be very
stable, any feedback on that. I think my users will be very happy with the
new groupwise and I hate to ruin it with an unstable messenger product when
we are not having any real issues with IM at the moment.