Encryption desktop for mac and Outlook 2011 won´t work

Hi:

I have the Symantec encrytion desktop for Mac version 10.3.1 and Mac OS 10.7.5 and...Outlook 2011 and i just can´t make the pgp and outlook work together, none of the emails i sent were encrypted and outlook keeps asking me for a certificate which i think is not the same as the key generated by pgp.

In the windows version, pgp shows a button next to the send email button, but in the outlook for mac there is no similar thing

what should i do to resolve this issue?

thank you

J.