Open Source Microsoft Exchange Server AlternativesTop Mail Servers and other similar apps like Microsoft Exchange Server
Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.
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- - Kopano is the most popular Android, iPhone, iPad, Android Tablet, SaaS & Self-Hosted alternative to Microsoft Exchange Server.
- - Kopano is the most popular Open Source alternative to Microsoft Exchange Server.
Comments about Kopano as a Alternative to Microsoft Exchange ServerAlmost everyone thinks Kopano is a great Microsoft Exchange Server alternative.all • positive • negative relevance • date
Free and open source, and has most of the things you want from Exchange, including shared calendars.0
Scalable, open source with a great UX and it has all the features I need0
Stable and cheap backend, flexible frontend support, open source, in full control of your data0Guest
OpenSource, better to maintain, "not Microsoft"-1Guest
I tried a lot of MS alternatives, OX, Zimbra, Zentyal, but what fits most with Outlook Sync was the new Kopano, it's more flexible. You can use the web app or desktop app too.-1Show more comments ▾5 of 6 comments
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
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- - Kolab Community is the most popular free alternative to Microsoft Exchange Server.
Kolab Community Features
Opinions about Kolab Community as a Alternative to Microsoft Exchange ServerMost users think Kolab Community is a great Microsoft Exchange Server alternative.
hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.Suggest and vote on features
hMail Server FeaturesDiscontinued
hMail Server is no longer supported by the people who created it and has been discontinued – so use it at your own risk.
Opinions about hMail Server as a Alternative to Microsoft Exchange ServerAlmost everyone thinks hMail Server is a great Microsoft Exchange Server alternative.
mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.Suggest and vote on features
mailcow: dockerized Features
- Dark Modemailcow: dockerized supports dark mode for comfortable usage in low light conditions.
- Ad-freemailcow: dockerized doesn't contain any form of external advertising.
- Two-factor Authenticationmailcow: dockerized supports two-factor authentication (2FA).
- Mail Filteringmailcow: dockerized classifies email messages according to specified criteria, allowing you to automatically recognize fraudulent or spam messages.
- Email Organizermailcow: dockerized allows you to take control of your inbox by filtering and control tools.
- Spam Filtermailcow: dockerized can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
- Support for Aliasesmailcow: dockerized supports aliases, so you can receive email without exposing your main email address
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.Suggest and vote on features
Zimbra Collaboration Suite Features
Opinions about Zimbra Collaboration Suite as a Alternative to Microsoft Exchange ServerMost users think Zimbra Collaboration Suite is a great Microsoft Exchange Server alternative.
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.Suggest and vote on features
Kolab Now Features
- Support for AliasesKolab Now supports aliases, so you can receive email without exposing your main email address
- Real time collaborationMultiple users can work together in Kolab Now simultaneously.
- Privacy focusedKolab Now is considered a privacy friendly alternative.
- End-to-End EncryptionKolab Now has E2E Encryption, for entire or parts of the app.
Comments about Kolab Now as a Alternative to Microsoft Exchange ServerSome users think Kolab Now is a great Microsoft Exchange Server alternative, some don't.Guest
With Microsoft no longer supporting our existing setup, this was a great alternative.2
grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.Suggest and vote on features
- Real time collaborationMultiple users can work together in grommunio simultaneously.
- Privacy focusedgrommunio is considered a privacy friendly alternative.
- Ad-freegrommunio doesn't contain any form of external advertising.
- Spam Filtergrommunio can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
Comments about grommunio as a Alternative to Microsoft Exchange ServerAlmost everyone thinks grommunio is a great Microsoft Exchange Server alternative.
As the first open source solution to offer a full-featured OutlookAnywhere (RPC over HTTP) and MAPI/HTTP implementation, grammm is the alternative to proprietary backends for native interoperability with Microsoft Outlook1
SOGo is groupware server with a focus on scalability and open standards.
SOGo provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV.Share your calendars, address books and mails in.Suggest and vote on features
Zentyal is a native Microsoft Active Directory implementation on Linux incorporating all the network services required in a small and medium business environment: Directory & Domain Server, Mail Server, Gateway and Infrastructure Server.
Comments about Zentyal as a Alternative to Microsoft Exchange ServerSome users think Zentyal is a great Microsoft Exchange Server alternative, some don't.Guest
Not an Exchange alternative at all. Does basic AD but that is about it. It is more of a gateway server.0Guest
While the comments below suggest that this is AD, not exchange replacement. It was supposed to ship with SoGo / openchange as a managed add-on. You also strangely enough can't have exchange without AD. but guests do keep on posting. Exchange is just an Add-On to AD. (It extends the schema).-1Guest
They do not share any common functionality. Zentyal is an Active Directory substitute, Microsoft Exchange is a groupware E-Mail (enterprise grade) server.-2Guest
No Exchange alternative and no support for MS Outlook Client7
The OX App Suite by Open-Xchange is web-based platform offering a suite of apps like an email client, calendar, contacts magement, cloud storage with synchronization and productivity apps for word processing, spreadsheets and presentations.Suggest and vote on features
OX App Suite Features
Opinions about OX App Suite as a Alternative to Microsoft Exchange ServerMost users think OX App Suite is a great Microsoft Exchange Server alternative.