Not any more!
- Change the default mail program under external programs to be explicitly Lotus Notes.
- Go into the advanced settings (Tools/Plugins/Manage Plugins from the Connect Client), and find and disable the “Sametime Exchange” feature.
- Rename OutlookJNI.dll in the following directory:
Suggestion #1 wasn’t enough to stop it, but one of either #2 or #3 did the job.
This was starting to really bug me, I was having to click “Cancel” and the “Yes I am sure” prompt twice!