Outlook 2003 Error:Your Exchange Server administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance

Outlook 2003 Error "Your Exchange Server administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance" when you try to connect Microsoft Outlook 2003 to newly installed Exchange 2007 server.

I am writing this blog entry keeping in mind that you are comming accross this issue after you finished installing Exchange 2007. While installing exchange 2007 you have selected the option that you have machines with outlook 2003 or earlier.

Cause: When you install Exchange 2007 fresh by default there is no public folder created. Exhcnage 2007 needs public folder created to have Microsoft Outlook 2003 or earlier supported version to connect to Exchange 2007.

Solution: In a new install of Exchange 2007 there might not be any Public folder present, create a Public folder on exchange server and then try to connect outlook 2003. Some times you might have to restart Information Store service on exchange server but that is not always the case.