there is an update for the moguls on the htc website. it will allow you to update the ROM on your mogul. most of the moguls are running 6.0 but this will update it to 6.1. The IM style text messaging programs is included in this update. It will automatically fix it's self. It does erase everything on your phone though, so you will want to back up your files first.
here is the link to the upgrade:
http://www.htc.com/us/SupportDownloa...cat=2&dl_id=73