DATATEXT.com, the Time Matters case management people, has souped up TM's email management capabilities in Service Release 3 to ver. 4.0, which I whiled away an indolent evening downloading @ 56K two nights ago.
It has had an email client as part of the program for, oh, about a year, and it's gotten to the point where it almost works.
However, after several days of intense experimentation, I conclude that it is still only a fancy front-end kludge to Outlook. And lousy as Outlook is, it does more than Time Matters in its email aspect. Funny, I just expected more from the nice people at DATATEXT.