All Mail accounts offline and won't come back

Suddenly this morning, all accounts (4) on my main, desk, computer went off line. Nothing I do brings them back. I've reset all login credentials and am out of ideas.
- I've checked with my ISP and they find nothing wrong
- other emails in our domain still working
- in fact, the mail is coming in on my other devices -- iPad, iPhone, Air, etc. (so it's not the server, clearly)
I'm left to think the Mail app on this one computer has something wrong.
Anybody know anything I can do?
Running 10.6.8 and Mail ver 4.6
Please help!

Thanks!
Seemed the answer was to disenable each account in Preferences, then click Enable This Account back to on. Each one in turn came back on line. Also found the problem in another computer in the office and it worked to bring that one back also.
Much appreciated.

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All Mail accounts offline and won't come back

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