I ran the Exchange connectivity test (had to buy a trusted certificate first) and it said that NTLM authorisation failed. I enabled Windows Authentication in IIS for the RPC folder and it is now working.
We have been running SBS 2003 with several users accessing email remotely through Outlook 2003 and 2007 for many years but recently all users are reporting Outlook is constantly asking for username/password and not accepting even though the username/password works elsewhere including Outlook web...
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