OBM AlternativesMail Servers & WebMail Providers like OBM

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 Linux, Web-based, Self-Hosted, Windows and Mac 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, SOGo and Microsoft Exchange.

filter to find the best alternatives

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

OBM

Mail Server
Free • Open Source

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

More about OBM

OBM alternatives page was last updated Sep 9, 2022

Nextcloud Hub
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.
51 Nextcloud Hub alternatives
License model
- Free • Open Source
Application types
- Team Collaboration Tool
- Calendar App
Platforms
- Self-Hosted
+4
Nextcloud Hub Features
1. Ad-free
2. Real time collaboration
3. Extensible by Plugins/Extensions
4. Cloud Sync
5. Privacy focused
6. Photo Gallery
Show all NaN Nextcloud Hub features ▾
Nextcloud Hub VS OBM
Is Nextcloud Hub a good alternative to OBM?
- Nextcloud Hub is the most popular Self-Hosted alternative to OBM.
- Nextcloud Hub is the most popular Open Source & free alternative to OBM.
- Nextcloud Hub is Free and Open SourceOBM is also Free and Open Source
- Nextcloud Hub is Privacy focusedOBM is not according to our users

Zimbra Collaboration Suite
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.
43 Zimbra Collaboration Suite alternatives
License model
- Freemium • Open Source
Application types
- Mail Server
- Calendar App
Platforms
- Linux
- Online
- Self-Hosted
Zimbra Collaboration Suite Features
Real time collaboration
ActiveSync
Active Directory integration
Show all NaN Zimbra Collaboration Suite features ▾
Zimbra Collaboration Suite VS OBM
Is this a good alternative to OBM?
- Zimbra Collaboration Suite is the most popular Web-based & Linux alternative to OBM.
- Zimbra Collaboration Suite is Freemium and Open SourceOBM is Free and Open Source

Kolab Community
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.
44 Kolab Community alternatives
License model
- Freemium • Open Source
Platforms
- Linux
- Online
- Self-Hosted
Kolab Community Features
1. Real time collaboration
2. CalDAV Support
3. WebDAV Support
4. IMAP Support
5. CardDAV Support
Show all NaN Kolab Community features ▾
Kolab Community VS OBM
Is Kolab Community a good alternative to OBM?

SOGo
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.
63 SOGo alternatives
License model
- Freemium • Open Source
Application type
- WebMail Provider
Platforms
- Linux
- Online
- Thunderbird
- Cloudron
SOGo Features
Support for Multiple Users
Scheduling
CalDAV Support
CardDAV Support
Show all NaN SOGo features ▾
SOGo VS OBM
Is SOGo a good alternative to OBM?

Microsoft Exchange
Exchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.
44 Microsoft Exchange alternatives
License model
- Paid • Proprietary
Application type
- Mail Server
Platforms
- Windows
- Online
- Self-Hosted
- Microsoft Office 365
Microsoft Exchange Features
Real time collaboration
Show all NaN Microsoft Exchange features ▾
+1
Microsoft Exchange VS OBM
Is Microsoft Exchange a good alternative to OBM?
- Microsoft Exchange is the most popular Windows alternative to OBM.
- Microsoft Exchange is the most popular commercial alternative to OBM.
- Microsoft Exchange is Paid and ProprietaryOBM is Free and Open Source

Horde
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.
43 Horde alternatives
License model
- Free • Open Source
Application type
- WebMail Provider
Platforms
- Online
- Self-Hosted
Horde Features
CalDAV Support
Show all NaN Horde features ▾
Discontinued
The last release (5.2.22) was in September 2017.

Horde VS OBM
Is Horde a good alternative to OBM?

Kolab Now
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.
77 Kolab Now alternatives
License model
- Paid • Open Source
Application types
- Calendar App
- Mail Server
Platforms
- Online
- Software as a Service (SaaS)
- DAVdroid
Kolab Now Features
1. Support for Aliases
2. Real time collaboration
3. Privacy focused
4. End-to-End Encryption
5. CalDAV Support
6. WebDAV Sync
7. CardDAV Support
Show all NaN Kolab Now features ▾
Kolab Now VS OBM
Is Kolab Now a good alternative to OBM?
- Kolab Now is the most popular SaaS alternative to OBM.
- Kolab Now is Paid and Open SourceOBM is Free and Open Source
- Kolab Now is Privacy focusedOBM is not according to our users

OX App Suite
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.
19 OX App Suite alternatives
License model
- Free • Open Source
Application types
- Mail Server
- WebMail Provider
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
+6
OX App Suite Features
1. Real time collaboration
2. Cloud Sync
3. Calendar Integration
4. Personal Information Manager (PIM)
5. Group Mail
6. German
7. WebDAV Support
8. WebDAV Sync
Show all NaN OX App Suite features ▾
OX App Suite VS OBM
Is OX App Suite a good alternative to OBM?

iRedMail
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.
67 iRedMail alternatives
License model
- Freemium • Open Source
Application type
- Mail Server
Platforms
- Linux
- BSD
- Self-Hosted
iRedMail VS OBM
Is iRedMail a good alternative to OBM?

OpenChange
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
29 OpenChange alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Linux
OpenChange Features
Exchange
Show all NaN OpenChange features ▾
Discontinued
Last release is from 2015

OpenChange VS OBM
Is OpenChange a good alternative to OBM?

CrossBox
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
39 CrossBox alternatives
License model
- Paid • Proprietary
Application types
- Mail Server
- WebMail Provider
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
CrossBox Features
File Hosting
Show all NaN CrossBox features ▾
+9
CrossBox VS OBM
Is CrossBox a good alternative to OBM?
- CrossBox is the most popular Android, iPhone, iPad & Android Tablet alternative to OBM.
- CrossBox is Paid and ProprietaryOBM is Free and Open Source

IceWarp
IceWarp integrates all communication & collaboration features in one unified solution. Available in cloud or for on-premises deployment, IceWarp is a great tool to share and exchange all information and ideas online, offline or via mobile devices.
41 IceWarp alternatives
License model
- Paid • Proprietary
Application types
- Team Collaboration Tool
- Mail Server
Platforms
- Windows
- Linux
- Online
Top IceWarp Features
1. Team discussion
2. Secure File Sharing
3. Real time collaboration
4. Unlimited team members
5. Outlook integration
6. Compatible with Microsoft Office
7. Cloud based
8. Document Sharing
9. Voice Chat
10. Video Conferencing
11. Integrated File Sharing
12. Shared Calendar
Show all NaN IceWarp features ▾
IceWarp VS OBM
Is IceWarp a good alternative to OBM?