When you go to merge contacts, you see the data of which contacts are and are not portal users...but I can't seem to bring this data onto the contact record itself. Any suggestions of a WFR, formula, etc.
3 answers
Unfortunately I don't know of a way to do this with formula's or WFRs.
This can be accomplished by having a custom contact field that is updated from an Apex trigger, but unfortunately that would require apex coding to accomplish.