"x new messages" appearing when loggin out

Hello all:

I think these portable applications are wonderful! I have tried Thunderbird and Firefox so far, and I'm having a concern with Thunderbird:

I am using this application at a place I am working at for my education. These folks are letting me use their computers, and I thought having a portable application such as Portable Thunderbird would allow me to have access to my school e-mail.

It works great, but when I eject my flash drive and logout, the message "x unread message" appears on the login page.

If there is a way to remove this, I would appreciate learning how to do it. It is embarrassing to me that it appears. I don't want my preceptor thinking I am downloading files onto his computer.

Any help would be appreciated!

Sincerely,

Mackie