This article is a part of a series describing the installation of Microsoft Office SharePoint Server 2007 (MOSS) on a Windows Server 2008 with the newly released SQL Server 2008. If you have deployed your environment using a Windows Server 2003 Active Directory you can use the mail service from Windows Server 2003.
Please have a look at
Hmm, where was that POP3 server role? Or was it a feature?
It doesn't exist any more... POP3 has been deprecated and is no longer part of Windows Server.