We performed a comparison between ProtonMail and Zimbra Cloud based on real PeerSpot user reviews.
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ProtonMail is ranked 11th in Email Applications while Zimbra Cloud is ranked 15th in Email Applications with 1 review. ProtonMail is rated 0.0, while Zimbra Cloud is rated 4.0. On the other hand, the top reviewer of Zimbra Cloud writes "Quick solution, but not very user-friendly or suitable for collaboration ". ProtonMail is most compared with Google Workspace, Microsoft Exchange Online, Microsoft Exchange, Zoho Mail and Superhuman, whereas Zimbra Cloud is most compared with Zoho Mail.
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