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According to a report from WPCentral, Skype has posted a job offering for a Software engineer for video on Microsoft platforms. Which points towards the Windows Phone 7 version of Skype getting video calling support.
There is no dates given on when we will have a version of Skype which will run on Windows Phone 7 or how Microsoft plans to integrate it into their Windows infrastructure. Since Windows Phone 7 Mango has already been released to manufacturing we know it wont probably be a part of that.