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OWA asks for users' logon credentials three times then kicks them out

I'm having a problem with OWA on Exchange 2000. Since I upgraded from Exchange 5.5 some of my users cannot use OWA. It requests the password three times then kicks them out. For other users, it is working great. All users have HTTP enabled. Thanks for any ideas.
Are you by chance using Microsoft ISA Server? If so, have a look at Outlook Web Access prompts you for logon credentials multiple times before inbox appears and see if that helps you resolve this problem. If that does not help resolve the problem, check the IIS log files for the HTTP responses that are being sent to the browser. You might also turn off friendly error messages in Internet Explorer to get a more descriptive error message.

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