We have Boolean fields with the values Yes/No which are widely used within our instance and workspaces. This field should not be used in any forms and is not connected to our CRM in any way. If we were to change this to a picklist (With three values of Yes/No/Unsub), is there a good understanding of what will occur? For instance:
1) Will leads hold their current value of Yes or No?
2) Will leads have their current value reset?
Any insights would be very much appreciated.
Bottom line, this is a destructive act. You almost certainly do not want this, but rather you should create a new field, use a Smart Campaign to copy old values, then hide the old field. Alternately you could export everyone whose Boolean is true before changing the datatype and then reimport them.