i share task with all users as suberbly explained here:
currently i do not allow phone numbers to be in-use with database users having said this
i use the customize column "Phone" label to filter my task list view
if my primary "schedule with" contact did not have a phone number i would have to assign a fictitious number to each contact.
Whats needed is some sort of filter that excludes my group "database users" from my task list view
any add-ons or work arounds