Not sure what you mean. For some reason, the Extreme comes without message+ installed, just with a lousy SMS app that is extremely limited. That's not enough for my needs.
So far I've managed to download the proper version of message plus (v6.4.5, which is for flips), install it, and set all the proper permissions. It's working fine, except for the external screen and the soft key set for messages. its also only syncing one way (syncs to my iphone which i prefer not to use, but not back from iphone to the flip). I was asking for help with fixing those issues, but they are minor compared to not having a decent messaging app.
If you have any idea how to get the external screen to work id appreciate, can't find any setting for it in any developer menu or app Ive seen so far.