最新版本是 Windows Media Center 2005 "Emerald" ：
Release: Late August to early September 2005
Features:

Native digital cable and card support

DRM Content protection

Improved burning with digital-rights management, network, HDTV, and DVD-RAM

Platform security

Additional languages and locations

"Premium TV"

Xbox 360 Media Extender support

Remote rendering of the UI with Xbox 360

Run 3rd Party apps out of the MCE process

WinCE Media Extender integration

"Bobsled" feature integration with other company’s devices

Bug Fixes :
890546 - USB devices stop working in Windows XP Media Center Edition

890629 - Download - Video problems may occur after you use the Media Center Zoom feature when you are watching video in widescreen format in Windows XP Media Center Edition 2005


New Features
Update Rollup 2 for Windows XP Media Center Edition 2005 will include support for 11 new languages and 20 new markets. Support for the new languages will be provided by localization packs which are to be installed on top of the English language version of Media Center Edition 2005 and Update Rollup 2 by OEM and System Builder partners.

Central European (Czech, Polish, Slovakian), Cyrillic (Russian), Turkish, Big5 phonetic IME for Traditional Chinese (Taiwan), Big5 stroke-based IME for Traditional Chinese (Hong Kong), and Korean

New Features
Teletext level 1.5 support: Teletext has been extended to support new locales and character sets. Feedback on language-specific character rendering within subtitles and Teletext pages would be appreciated.
Digital audio service: Support for DVB-T audio only services has been added to this release.