A couple of days ago I blew up my home machine (don't ask).

I use Thunderbird as my email program. When I leave in the morning for work, I quit Thunderbird and use webmail to check my personal mail throughout the day.

For the last two days I have had no mail when I check with the web client.

When I come home and start Thunderbird, the mail is already there(!). W.T.F?

When I quit Thunderbird, I checked the task manager and there are no mysterious mail-reading processes that I can find.

What the heck can be downloading my mail to Vista if I have no mail program running?