Am I so unlucky that nobody has got the same problem?

I am try to explain a little bit better my previous post
In windows XP: I make the installation.
I select Zimbra desktop as preferred application for email.
Set up it on Internet Explorer>preferred programs>Email
Now Zimbra Desktop sendto>email feature works, a little bit slowly but it works.
In windows 7: I make the installation.
Make Zimbra desktop as preferred application for email by Preferences>General>System Defaults checked Use Zimbra Desktop as default mail application
Open Preferred program>set preferred program utility.
In this case Zimbra Desktop (or zdcliente or whatever looks like zimbra desktop) does not appear on choisable application. (see jpg attachments)
If I open the contextual menu (click on right) and select send to>Email, it appears a box that inform me "No one client for email installed...."
What can i do? Anyone can help me to solve this matter?
Thanks