<P>One of my regular customers is experienced a very odd phenomenon while using Vista to read my e-mails. His description isn't very clear, but as far as I can tell, when he hits the reply button in Outlook (or whatever the rubbish Micro$oft e-mail client is called), a reply window opens, but as soon as he points to the window to try to write a reply, the window starts "vibrating", making it impossible to write anything in it! He only has this problem with e-mails from me, written in Pegasus Mail 4.41, and only when the original mail contained an attachment. None of my other customers experiences this, but they all use Windows XP. Is this some sort of over-sensitive antivirus function in Vista which reacts to any e-mail attachment sent by a non-Micro$oft client, or what? I have used Pegasus for over 11 years now and it is by far the best e-mail client I've seen, so I really don't want to have to switch to some other application just because of this one customer.</P><P>Has anybody else experienced anything like this? If so, does anybody have any idea what can be causing it, and how it can be remedied?</P><P>Cheers,</P><P>Geoff</P>