A new version of the add-in is now available: go to http://research.microsoft.com/en-us/downloads/60860f41-88ab-4bb4-8104-765feca9cfed/ to start playing with it.

New features include nicer buttons (well, I think they're nicer), better indication to the recipient about the reply, etc. state and the ability to re-enable the operations, and improved missing attachment detection.

If you discover any problems or have any other feedback you'd like to give, please use our discussion forum (or just post something here).