Some systems even charge a subscription fee for each user every year. Service Agreement holders IMail Server has only two price levels, and the annual service agreement is optional. See the IMail pricing page for details, and then see how much it will cost to set up each for your organization. Check out IMail Server's modest System Requirements . We thoroughly enjoy your software, in fact we even own a copy of Microsoft Exchange Server which will continue to collect dust, since IMail has been so trouble free over the past three years.
Time is a system administrator's most precious and irreplaceable resource.
It's easy to purchase, quick to install, and it doesn't require an advanced degree to keep it running.