Unable to open your default email folders. You must connect to your microsoft Exchange Server computer with the current profile before you can synchronize your folders with your offline folder file User is fine on OWA Deleted profile..// Renamed MSMAPI32.DL>> failed The username iscorrectly mapped when we use the Check Name option while creating a new profile!! Receiving the same error before downloading mails Need urgent help with the above error

Did you check the event logs on the Exchange server? I had a very similar issue and was getting 'Mapi session exceeded the maximum of 32 objects of type "session"' messages in the event log. Here's the fix: http://support.microsoft.com/default.aspx?scid=kb;EN-US;948496 & http://support.microsoft.com/default.aspx?scid=kb;EN-US;324270

Did you installed Windows 2003 SP2 on the Exchange server or if it is Windows 2003 SP1, then check if you have installed the hotfix KB912222? Please try disabling Enable TCPChimney, EnableRSS, & EnableTCPA registry keys HKLM\System\CurrentControlSet\Services\TCPIP\Parameters And then reboot the server? Please let me know if it is not working. If you don't want to disable manually then install KB948496 hotfix, it will automatically disable Enable TCPChimney, EnableRSS & EnableTCPA registry keys.

Did this fix work for you Abhileo. I am also facing same problem for one USer. My Server is Exchange 2007 and Client is Outlook 2003.