When comparing Zimbra Web Client vs Cypht, the Slant community recommends Cypht for most people. In the question“What are the best self-hosted webmail clients?” Cypht is ranked 10th while Zimbra Web Client is ranked 12th. The most important reason people chose Cypht is:
It has a whole page of security-related functionalities listed. To sum it up, Cypht got a perfect score from ["e-mail privacy tester"](https://www.emailprivacytester.com/).
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Pros
Pro Full-featured collaboration solution
If you are looking for an alternative to Gmail, look no further than Zimbra. While not a complete document solution it does have some document features as well.
Pro Great security system
It has a whole page of security-related functionalities listed. To sum it up, Cypht got a perfect score from "e-mail privacy tester".
Cons
Con Heavy and monolithic
Zimbra doesn't much work with its host platform as much as it brings its own copies of utilities. If you want something small and "plays well with others" integratable...this is not it. Too heavy to run on a RaspberryPi if you're looking for something for just a few users.
Con Linux only
There is no installator for Windows