I created a VPS with CentOS. I think I started with CentOS 5.6 and Zimbra 6.8 Community Version. I last updated it about two years ago, so that it is now CentOS release 5.8 and Zimbra 7.1.1_GA_3196.RHEL5_64.

It intermittently was used by different groups of about 50 people who accessed it using IMAP and the web portal without any problem.

Now all it is doing is continuing to collect email subscriptions from software vendors I was trying out at the time, though some other people may still be using it. I don't think anyone else even knew how to access the administration console, and I haven't logged into the admin console in over a year.

Occasionally, log into the shell, because of a bug I never bothered to address. It slowly collects a lot of temporary files. Speaking of which I should do that now:

`Last login: Sat Sep 1 19:27:28 2012 from __`.

Then I ran:

    for i in {0..9}
    do
        find /tmp/jna${i}*.tmp -cmin +30 -exec rm {} \;
        echo $i "out of 9" `date`
    done

To be honest, that is ugly, and I should upgrade. The script took 30 minutes to run, and found 20GB that had accumulated in under 5 months. However, it isn't critical for anyone, and < 3hrs/year is a nice level of admin effort.

To answer your question: I'm sure not every module is functioning perfectly, and though it hasn't needed much maintenance over the past year, it hasn't been under much load either.