Problem existed in 2.0
I have a laptop that had 1.4 and 2.0 installed concurrently. This same problem existed in 2.0 but was not exhibited in version 1.4. I have 4 machines all running 7.1.1 and this issue affects only the POP email accounts. The difference that began at 2.0 was the separation of the contacts list to local folders. Previously they were a component of the POP email account. In the previous version you could not utilize contacts across accounts in a single e-mail message (at least I wasn't able to). The program is now capable of that. That is a nice feature. You don't need duplicate contacts in each account.
Remember - DOS/Windows captured the computing world ONE DESKTOP at a time. Don't ignore or forget Zimbra Desktop. It is the key to topple MS Outlook.