My suggestions of improving Messanger

Search in PM's should also look for PM authors/participans [now only look for text]

There is a Lack of ajax preview of messages - could work same like on forum list's preview

There is a Lack of ajax fast answer - page reloads after sending PM.

Bulk actions could be on top by default

There are no links in PM notification list, when Message which is in custom folder in PM's ( have reported that with no answer:( maybe it's corrected in this release i haven't updated yet)

some other upgrade's ?

one more:

Bulk email

i am up for sending images encoded in email, not hotlinking images in bulk mail, most people got it turned off in their mail programs i suppose...