Hello elam!
The ZeXtras Mobile module provides an Exchange ActiveSync stack to your server, so any Exchange ActiveSync client can synchronize through ZeXtras Mobile. As Innovot correctly said, the only Outlook version capable to do so is Outlook 2013, because older versions use a different protocols (MAPI or EWS).
You can find more informations about the ZeXtras Mobile module at
http://www.zextras.com/zextras-mobile-for-zimbra.html, while the technical docs can be found on the ZeXtras Wiki at
ZxMobile - ZeXtras Suite Wiki
Have a nice day,
Cine
the ZeXtras Team
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