I think what your requirement to have a email link which displays the email id and on click of that it should open new email page from outlook with email id in the to list. If my assumption is correct then just add the pxEmail control in the UI.
If you really want to integrate outlook and pega, Then you need to install pega plugin for outlook in the client. This works with pega sales framework.
In Pega 7.2 there is a conrol called pyEmailLink under Pega-Gadgets:07-10-01
It displays an anchor link with a target using the "mailto:" protocol to open the client's e-mail program with a message to the e-mail address specified in the value of the property to which this control is applied.
It is used in the Parties mini tab on the Perform and Review harnesses for work. Check out the control and its usage in pyMiniPartyDetails section.