I'm pleased to report that after a couple tries, the folks at SnapperMail fixed a glitch involving IMAP communication with GroupWise 6.5. The issue appeared to involve the way GW was sending HTML formatted messages to snapper mail which caused the sync to fail with Protocol Error messages. I've been using the 2.0.3.08 beta for a few days now with no further problems.

Way to go Stuart Nicholson at SnapperMail!

I find this kind of responsiveness from a software company rare these days. It's nice to find a pocket of it once in a while.