Microsoft Fax
Microsoft Fax, also called Microsoft at Work Fax (AWF), is the fax component to provide Send-and-Receive Fax capability; sent and received faxes were stored in the same .pst file as other messages, first attempt of unified messaging by Microsoft; also the ability to act as fax server, which is not available in later versions of Windows until Windows Vista
Read more about this topic: Windows Messaging