On my XP Pro, an XP and a Vista machine we are having the above problem.  The
emmails can't be opened nor the task accepted.  The task itself is not
updated even though the email is received.

I see this was a problem last year that had to do up a couple of security
updates which we don't have on our machines.  Is there new information or
fixes available for this problem.

BTW several machines in the office work fine.  Most are running 2000.