Can’t connect via Internet to Exchange Server 2003 from Outlook 2003/2007?

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When you try to use Microsoft Office Outlook 2007 or Microsoft Office Outlook 2003 to connect over the Internet to your mailbox on a Microsoft Exchange Server 2003 based-computer, you are prompted for your logon credentials many times, and you do not connect to Exchange Server 2003.

It may be the issue with regards to Remote procedure call (RPC). Please find the following Microsoft Support KB article which provides what is the issue all about and its resolution.