There are many alternatives to Microsoft Exchange as a web app if you are looking for a replacement. The best Online alternative is Google Workspace. It's not free, so if you're looking for a free alternative, you could try Kolab or Infomaniak kSuite. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Exchange and many of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to Microsoft Exchange are Kopano, Zimbra Collaboration Suite, SOGo and grommunio.
Google Workspace delivers a cloud-based suite combining Gmail, Calendar, Meet & Drive to enhance collaboration through tools like Docs and Sheets. Offers secure storage options, custom domain emails, and robust management capabilities with 2FA and 24/7 support.
Kolab provides a FOSS communication & collaboration solution that can be completely self-hosted. Take back control of your data and access it via the webinterface, or existing mobile & desktop clients.
Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.
Stable and cheap backend, flexible frontend support, open source, in full control of your data
Scalable, open source with a great UX and it has all the features I need
Suite for secure email, calendaring, file sharing, chat, and online meetings, offering real-time collaboration on docs, GDPR compliance, customizable branding, renewable energy use, advanced user management, and all data hosted in Switzerland.
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.
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.
grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.
Great Activesync Support POOR and I mean VERY Poor Calendar that has a mind of It's own, setting events or reminders is a NIGHTMARE
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 Outlook
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.
With Microsoft no longer supporting our existing setup, this was a great alternative.
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.
Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD. In order to modernize the Citadel platform for the Internet, the Citadel/UX developers added functionality such as shared calendars, instant...
Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
United States
Switzerland
Netherlands
EU
Canada
Germany
Bosnia & Herzegovina
Free and open source, and has most of the things you want from Exchange, including shared calendars.