I am still having issues with Windows 7 and Exchange Server authentication. Sometimes it works, sometimes it doesn't. Both Windows XP and Windows Vista worked fine on the same machine authenticating to the same server. The Windows 7 box is not on the domain. I have the correct credentials stored. Often, I can fire up email successfully and it will work all day, but the next morning my account will be locked out - apparently due to Windows 7 failing and retrying credentials. PLEASE HELP!

Windows 7 RC & Exchange Server 2007 work fine

Windows 7 RC & Exchange Server 2007 work Clearly, they do not. This is happening with multiple fresh install of Windows 7 against an Exchange server that has been deployed for quite a long time. There are close to a hundred Windows XP and Vista machines that are working fine. Only Windows 7 has this problem. We have run down every authentication issues thread we could find on Windows 7 and Exchange and tried everything suggested, nothing works.