How to change standard e-mail client in WM6.1

[Guest sretlow]

How can I change teh standard e-mail client from tmail.exe to another client?

I already changed the standard sms (text) client to SMS-Chat by changing registry :\HKLM\Software/Microsoft\Shell\RAI\:MSINBOX. But When I try the same on :MSPOutlook nothing seems to change. I want to change this because when I have the email (tmail client) open SMS-Chat doesn't open anymore but only the standard tmail view. So I would like to open only to 3e hand programms (sms and e-mail) so tmail doesnt open anymore.