Zimbra used to be on yahoo platform and is now acquired by VMware and sold as a virtual appliance with features like "easy setup", "lower TCO than Exchange", "Support more users with less"...
Below quoted from University of Pennsylvania : Zimbra case study
"Adam says they have found Zimbra takes significantly fewer man-hours to administer. In absolute terms Exchange servers take 33% more effort and require one extra full-time headcount per year — even with 4.4 times more users on the Zimbra servers."
Full story link as below
Zimbra TCO Bests Microsoft Exchange in University of Pennsylvania Case Study
Zimbra case studies
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