Hi Marc,

since the "enabled" status is not exposed via User Profile properties through SharePoint, there is no way to "patch" this quickly to allow for "auto-outfiltering" these profiles labelled as missing from import (but in reality "marked for deletion"). Furthermore, the issue here is not really PeopleZen but more along the lines of SharePoint house-keeping and best practices. These "missing" profiles should theoretically be deleted from your SharePoint SSP's user profiles store. It is not just a matter of hiding these unused profiles from PeopleZen's views, you might want to make sure that they never actually occupy storage space in your user profiles DB in the first place and get cleaned up. They would otherwise still show up in SharePoint search results and elsewhere.

Typically if these profiles do not get auto-removed, I'd advise you or the admin responsible to look into the following:

3 interesting facts about SharePoint user profiles
Cleaning Inactive Profiles from SharePoint 2007
How it works: MOSS 2007 automatic user profile removal

Generally, PeopleZen is just a much-needed GUI over the data already in your SharePoint. While certain filtering scenarios ("show only dept X") are fully possible and encouraged, the core profile active/inactive state cannot be queried at this level but only at the underlying SQL level. While the next major build PeopleZen 2.0 will in fact offer, optionally, querying the DB directly without using the User Profiles APIs, that release is still a few months (2-3) off and strictly speaking I'd always recommend cleaning your SP user profiles DB of "zombie profiles" over just hiding them visually.