Top 7 Zimbra alternatives

Last updated: August 26, 2015
Zimbra
Zimbra Collaboration Server is an email and calendar server plus much more; think about it like a next-generation Microsoft Exchange server. In addition to email and calendar, it provides file sharing, tasks, contacts, social media, document management and simplified administrative controls all in an award winning webmail user interface built with the latest AJAX web technology. ZCS also provides mobility and syncs to desktop client applications; the server is deployed on commodity Linux and Mac server hardware.
The best Zimbra alternatives:


Microsoft Exchange


Microsoft Exchange Server is the server side of a client–server, collaborative application product developed by Microsoft. Exchange's major features consist of electronic mail, calendaring, contacts and tasks; support for mobile and web-based access to information; and support for data storage. Microsoft Exchange free open-source alternatives are Open-Xchange, Zimbra, SOGo, Zarafa.

GMail


Gmail is a free, advertising-supported email service provided by Google. Users may access Gmail as secure webmail, as well via POP3 or IMAP protocols. Gmail's spam filtering features a community-driven system: when any user marks an email as spam, this provides information to help the system identify similar future messages for all Gmail users. Google also provides GMail alternative for business - G Suite Mail.

Lotus Notes


Lotus Notes is the client of a collaborative platform. It's an integrated desktop client option for accessing business e-mail, calendars and applications on IBM Lotus Domino server. Lotus Notes free open-source alternatives are Open-Xchange, Zimbra, SOGo, Zarafa.

Office 365


Microsoft Office 365 is commercial software plus services offering a set of products from Microsoft. Office 365 includes the Microsoft Office suite of desktop applications and hosted versions of Microsoft's Server products (including Exchange Server, SharePoint Server, and Lync Server), delivered and accessed over the Internet, in effect, the next version of Business Productivity Online Suite (BPOS). Office 365 free alternatives are Zoho, Google Apps.

G Suite


Get business email, video conferencing, and cloud storage from Google. All you need to do your best work, together in one package that works seamlessly from your computer, phone or tablet. If you are looking for self-hosted G Suite alternatives pay attention to Microsoft Office and ONLYOFFICE.

MS Outlook


Microsoft Outlook is a personal information manager from Microsoft. It can be used as a stand-alone application, or can work with Microsoft Exchange Server and Microsoft SharePoint Server for multiple users in an organization, such as shared mailboxes and calendars, Exchange public folders, SharePoint lists and meeting schedules. MS Outlook free alternatives are Mozilla Thunderbird, Opera Mail, EssentialPIM.

Kerio Connect


Kerio Connect is a commercial mail and groupware server developed by Kerio Technologies. It runs on Windows, Linux, and Mac OS X. Its features include encrypted access using SSL, anti-virus and anti-spam protection, native over-the-air handheld synchronization, webmail interface, connector for Microsoft Outlook and groupware features.