Windows Mail - 'Reply to All' not working

Hiya,

I'm using windows mail, no problems with it apart from when I hit the 'reply to all' button, it always misses off one of the recipients (and it is in the 'To' box, not the 'bcc' box, or even 'cc').

Its not a major issue, because I can add the person in manually each time, which I have been doing and it sends the email fine, but why should I have to?!

The address in particular is a virgin.net address, I'm not sure if this makes a difference, and funnily enough, this person has the exact same problem with 'replying to all' in that it never picks me up and she has to add me in manually as well. I am also a virgin.net address.

I've had a look at the details in the contacts folder, and there is nothing different between the ones that get selected and the one that doesn't as far as I can see.

Any ideas?
Thanks :confused