PPC version 2.21 has been released. It supports HP Photosmart Mobile Camera and Hitachi G1000 Pocket PC Phone Built-In Camera.
Both PC version 2.2 and PPC version 2.21 are compatible with the latest version of .NET Messenger Service. The PC version supports Microsoft Live Communications Server 2003 and other SIP servers. The PPC version supports full-duplex voice on Pocket PC 2003 and Smartphone 2003.
Microsoft Portrait 2.21
EDIT: Corrected typo.