There is little reason to create a DL if you've already gone to the
trouble of creating categories. Categories can be used the same way you
would a DL. Just switch to the By Category View, select the Category
Header, then Actions > New Message to Contact...

If you still feel you must create a DL from a Category, there is a
clumsy way to do so. Change the Contacts Folder View to by Category.
Right click and drag the Category required to a newly created Contacts
subfolder then choose Copy. Make sure the new subfolder has been enabled
as an email address book by right clicking on it and choosing Properties

address book. Create your new Distribution List, give it a name and and
make sure the Show Names drop down field points to this new subfolder.
Then shift select all the contacts and add them to the DL.

------
Russ Valentine
[MVP-Outlook]