Connect to Exchange via HTTP login problems

Hello,

I have set up our SBS so that Exchange cleints can logon through HTTP.
This has been working fine for a few weeks, but now a client (just one
so far) keeps getting the login prompt when trying to connect. After
the first login prompt the client actually connects and downloads
emails etc. but the login prompt keeps coming back and the connection
is lost. And if one clicks on cancel then the Outlook Exchange 2003
client just goes offline. Any ideas?

.

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