Outlook Express is a windows based email client and gets shipped with any windows os. It has nothing to do with your ISP.
What I THINK may be the problem here, is that you signed up for an email account at your previous ISP, and you imported that email account settings into your outlook express. I t may be that your previous ISP discontinued that email account of yours, thats why outlook express keeps on asking you to login.
If you do not need that email account from your previous ISP, just delete it in outlook express, and that should solve the nasty popup to login.
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