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<meta name="Viewport" content="width=320; user-scaleable=no; initial-scale=1.0" />

Allows developers to give explicit instructions to mobile brower(s) regarding page layout and user manipulation responses.

Viewport Property	Width
width	Sets the width of the viewport in pixels, or the keyword device-width, meaning whatever the width of the screen is (range = 320 – 10,000).
height	Sets the height of the viewport in pixels or the keyword device-height (range = 480 – 10,000).
user-scalable	Indicates whether or not user can scale viewport (zoom in/out). Values yes, no, default is yes
initial-scale	Sets initial scale of viewport (range = 0.1 – 10.0).
minimum-scale	Sets minimum allowable scale of the viewport (range = 0.1 – 10.0)
maximum-scale	Sets maximum allowable scale of the viewport (range = 0.1 – 10.0)

In ie, meta name="Viewport" overrides meta name="HandheldFriendly" and meta name="MobileOptimized".

The ie Mobile Viewport on Windows Phone 7