I'm using Outlook 2003 SP3 with a single IMAP server. Recently I did a
reinstall of XP and added my old PST to my new installation. Now, I
start to receive a duplicate of every new email.

The duplicate is identical except for the fact that my email address
appears multiple times on the To: line. Note that the number of times
it appears is irrelevant to how many times I receive it: even if the
To: line contains my address 8 times, I still only receive two copies
of the email.

Removing, then re-adding my email account details using Tools - Email
Accounts clears up the problem for a few hours or so, but it then
reappears.

I thought my anti-virus email scanner might be a problem; I tried
uninstalling it but still no luck.

Any help appreciated,

P.