Font issues in Outlook 2003

[Bartly]

We have a user with his default font set for Arial for new and reply
messages. The format is HTML, and is not using Word as editor.

When he composes and sends an email the recepient receives it as Times New
Roman. This appears to only happen with Outlook recipients becasue it is
still Arial when sent to a web account like Yahoo.

I believe he is the only one that this is happening to out of our 100 users.

Any clues on this one?

Thanks