Were you able to create another contact-type folder?
If so, when you right-click on the new contact-type folder, is there an
OAB tab? If you did not create a *contact* type of folder then there
won't be an OAB tab (where you can elect to include the contact-type
folder in the OAB container). The OAB tab is used to specify if that
contact-type folder will get listed in the OAB container which lists the
enabled contact-type folders. E-mail, journal, and notes folders are
not lists of contacts so they aren't eligible for inclusion in the OAB
container.
The TYPE of the folder matters. Make sure you selected Contacts for
the type of folder when you created a new folder. When adding a new
folder, make sure the "Folder contains" is set to "Contact Items" to
create a contact-type folder. See the "Create New Folder" dialog for
OL2007 shown at:
http://www.ucalgary.ca/it/help/articles/email/clients/outlook07/folders
Notice the value of the "Folder contains" selection. No, you don't
want to create an e-mail type of folder (as shown). You want to create
a contact type folder because that's the type of folder that can be
included in the OAB container which lists the contact-type folders.