timebomb emails
I can't see any good use for this: emails that self-destruct after a time limit. I can see lots of bad uses, mainly revolving around destroying evidence. I also wonder about the forwarding-prevention - it seems like currently, if you forward an email in the usual thoughtless, top-quoted manner, you're inadvertently attaching a pretty useful audit trail to the message as well. Now, you'll just cut and paste the body into a new mail, forcing you to consider not, say, including any of the headers.
Microsoft: enablers of plausible deniability.
Microsoft: enablers of plausible deniability.

no subject
As i've said before, it'll all end in tears.
no subject
no subject
no subject
I find it annoying and have set my filters to autoreject them.