OBM Alternatives

OBM is described as 'free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices' and is a Mail Server in the office & productivity category. There are more than 10 alternatives to OBM for a variety of platforms, including Web-based, Linux, Self-Hosted, Windows and SaaS apps. The best OBM alternative is Nextcloud Hub, which is both free and Open Source. Other great apps like OBM are Zimbra Collaboration Suite, Kolab Community, Microsoft 365 and Horde.

OBM alternatives are mainly Mail Servers but may also be WebMail Providers or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of OBM.

OBM alternatives page was last updated

OBM

Free • Open Source
Mail Server

OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support...

More about OBM

Nextcloud Hub
Is this is a good alternative?
Yes
No
Free • Open Source
Team Collaboration Tool
Calendar App
Document Manager
Self-Hosted
53 Nextcloud Hub alternatives
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
- - Nextcloud Hub is the most popular Self-Hosted alternative to OBM.
- - Nextcloud Hub is the most popular Open Source & free alternative to OBM.
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Nextcloud Hub Features
1. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
2. Ad-freeNextcloud Hub doesn't contain any form of external advertising.
3. Real time collaborationMultiple users can work together in Nextcloud Hub simultaneously.
4. Extensible by Plugins/ExtensionsNextcloud Hub can be extended with add-ons, plugins and extensions.
Photo Gallery
Zimbra Collaboration Suite
Is this is a good alternative?
Yes
No
Freemium • Open Source
Mail Server
Calendar App
Team Collaboration Tool
Linux
Online
Self-Hosted
41 Zimbra Collaboration Suite alternatives
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.
- - Zimbra Collaboration Suite is the most popular Web-based & Linux alternative to OBM.
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Zimbra Collaboration Suite Features
1. Real time collaborationMultiple users can work together in Zimbra Collaboration Suite simultaneously.
ActiveSync
Active Directory integration
Kolab Community
Is this is a good alternative?
Yes
No
Freemium • Open Source
Linux
Online
Self-Hosted
42 Kolab Community alternatives
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 Features
1. Real time collaborationMultiple users can work together in Kolab Community simultaneously.
CalDAV Support
WebDAV Support
IMAP Support
CardDAV Support
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Microsoft 365
Is this is a good alternative?
Yes
No
Paid • Proprietary
Mail Server
Project Management Tool
Online
Software as a Service (SaaS)
88 Microsoft 365 alternatives
Microsoft 365 is a subscription-based software services that licenses Microsoft Office products for on-premise or cloud-based use.
- - Microsoft 365 is the most popular SaaS alternative to OBM.
- - Microsoft 365 is the most popular commercial alternative to OBM.
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Microsoft 365 Features
1. IFTTT IntegrationYou can connect different services to automatically trigger actions within Microsoft 365 using IFTTT.
2. Real time collaborationMultiple users can work together in Microsoft 365 simultaneously.
Document Workflow
Document sharing
Web-Based
Horde
Is this is a good alternative?
Yes
No
Free • Open Source
WebMail Provider
Online
Self-Hosted
40 Horde alternatives
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.
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Horde Features
CalDAV Support
Discontinued
The last release (5.2.22) was in September 2017.
SOGo
Is this is a good alternative?
Yes
No
Freemium • Open Source
WebMail Provider
Linux
Online
Thunderbird
Cloudron
65 SOGo alternatives
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.
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SOGo Features
Support for Multiple Users
Scheduling
CalDAV Support
CardDAV Support
Kolab Now
Is this is a good alternative?
Yes
No
Paid • Open Source
Calendar App
Mail Server
Cloud Storage Service
Online
Software as a Service (SaaS)
DAVdroid
76 Kolab Now alternatives
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.
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Kolab Now Features
1. Support for AliasesKolab Now supports aliases, so you can receive email without exposing your main email address
2. Real time collaborationMultiple users can work together in Kolab Now simultaneously.
3. Privacy focusedKolab Now is considered a privacy friendly alternative.
4. End-to-End EncryptionKolab Now has E2E Encryption, for entire or parts of the app.
CalDAV Support
WebDAV Sync
CardDAV Support
OX App Suite
Is this is a good alternative?
Yes
No
Free • Open Source
Mail Server
WebMail Provider
Calendar App
Linux
Online
Self-Hosted
Software as a Service (SaaS)
20 OX App Suite alternatives
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.
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OX App Suite Features
1. Real time collaborationMultiple users can work together in OX App Suite simultaneously.
2. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
3. Calendar IntegrationOX App Suite lets you sync your tasks and events with your calendar application.
Personal Information Manager (PIM)
Group Mail
German
WebDAV Support
WebDAV Sync
OpenChange
Is this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Linux
30 OpenChange alternatives
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
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OpenChange Features
Exchange
Discontinued
Last release is from 2015
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Microsoft Exchange Server
Is this is a good alternative?
Yes
No
Paid • Proprietary
Mail Server
Windows
Online
44 Microsoft Exchange Server alternatives
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions.
- - Microsoft Exchange Server is the most popular Windows alternative to OBM.
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Microsoft Exchange Server Features
1. Real time collaborationMultiple users can work together in Microsoft Exchange Server simultaneously.
iRedMail
Is this is a good alternative?
Yes
No
Freemium • Open Source
Mail Server
Linux
BSD
Self-Hosted
69 iRedMail alternatives
A fully fledged, free email server solution, an open source project (GPL v2).

Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support.

Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.

Works on both no.
iRedMail has no features, suggest some!
Blue-Mind
Is this is a good alternative?
Yes
No
Paid • Open Source
Mail Server
WebMail Provider
Calendar App
Linux
10 Blue-Mind alternatives
Blue Mind is a complete solution of company messaging, calendars and collaborative work. It aims to enable you to work daily with comprehensive, useful, efficient and effective tools.
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Blue-Mind Features
ActiveSync
Calendar Sync
Reduce mobile data usage
REST API