Not running nginx.
62160 looks bad, but it started in 7.0 not 7.1.2. Is there actually a next uid of 0 on the Zimbra server, or is this an Outlook client issue? If 0 is on the server, it's hard to believe that only Outlook would be affected. And yet that's the report. Given the weak report and the fact that we have no Outlook IMAP clients, I think we're OK.
So, I guess we're on.