There is an update to the Lync Mobile client for Windows Phone. Finally this update displays Mobile Phone numbers on the Contact Cards (this was something I really missed)
Additionally : If you were having issues joining an online meeting with Lync Mobile on WP7 then this is your solution :)

This cumulative update fixes the following issues:

• 2750301 An update is available that enables Microsoft Lync 2010 for Windows Phone to display an Inactive presence status after 5 minutes in an idle state
• 2736032 An update is available that adds an example of a user name format in the "Details" section in Lync 2010 for Windows Phone
• 2736033 "Could not connect to conference" error message when you click a "Join online meeting" link in Lync 2010 for Windows Phone
• 2735320 Mobile phone number is not displayed in a user's contact card in Lync 2010 for Windows Phone
• 2751200 You cannot join a conference by clicking a URL in Lync 2010 for Windows Phone

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