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Microsoft Reader has been enhanced to take advantage of the unique capabilities of UMPC devices.
With the Microsoft Reader Optimized for Origami you get:

• Innovative content support: Enjoy thousands of Owner Exclusive eBooks on any Microsoft Reader 2.0 or higher enabled device.
• New touch screen navigation experience: Page turning and larger advanced navigation controls right at your fingertips!
• Updated Audible support: Listen to your favorite audio books using Microsoft Reader technology
• Great on-screen readability: ClearType display technology that makes text on screen crisper and easier to read than ever before. The rotate and resize features enable you to take full advantage of your Origami device in landscape and portrait modes.
• Dynamic reading features: Enhance your texts with highlighting, bookmarks, notes, and drawings. Plus, you can view your annotations and rename or erase any of them at any time. The inking features make it easy to add rich handwritten notes and sketches to your books.
• Great support for embedded graphics: Use the new pan and zoom feature to get a close-up view of graphics and pictures. Keep your zoomed view open on your desktop even as you page ahead in your book.

Supported Operating Systems:

• Windows Vista Ultimate;
• Windows XP Tablet PC Edition
• Windows XP Tablet PC Edition: Microsoft Touch Pack
• Windows Vista: Microsoft Origami Experience

For more information, visit Origami project blog

To download the Microsoft Reader visit Microsoft download Center

Source: GottaBeMobile and Microsoft