OBM is unclaimed —

OBM

Access your enterprise from everywhere·obm.org

OBM is a free, open-source messaging and collaboration (groupware) platform supporting shared calendars, contacts, tasks, and email for anywhere from a couple to thousands of users. It offers a web interface, strong mobile device support via ActiveSync, and connectors for Thunderbird/Lightning and Outlook. OBM also provides a provisioning API for creating users and groups in bulk.

What it's for

shared calendar and meeting schedulingcontact managementtask managementwebmail accessmobile synchronization via ActiveSyncuser and group provisioning via APIcentralized IT administration for groupware

Features 20

ActiveSync support for smartphones (iOS, Windows Phone, Android, BlackBerry)
Advanced resource management
Antivirus & antispam, SSL access, backups, high availability
Automatic email forwarding
Centralized administration and batch management
Fine-grained rights management (delegation)
Group mailing lists
Import/export ICS files
MAPI-based Outlook groupware connector with calendar/contacts/task sync
Meeting scheduling
Multi-domain and sub-domain handling
POP/IMAP/SMTP support
Private and public contacts
PST import in Thunderbird
Server side vacation message
Shared calendars for users, groups and resources
Shared mailboxes
Tasks management
Thunderbird/Lightning and Outlook connectors
Webmail access in web interface

At a glance

free tieropen sourceself-hostableAPI

TypeWeb app

DeploymentSelf-hosted

PlatformsWeb, Windows, Linux, iOS, Android

LanguagesEnglish, Français, Tiếng Việt

Forteams of all sizes, organizations needing groupware/collaboration

CompanyLinagora

Integrations

OutlookThunderbirdRoundcubeActiveSync

Resources

Docs

Pricing

OBM itself is free with no license cost and no freemium offer; a separate paid SaaS hosting option is offered through Linagora but pricing is not publicly listed.

OBM (self-hosted)Free

Free as in speech and free as in beer; no license cost, no freemium offer.

No stated user limits; scales to thousands of users

Paid SaaS account (via Linagora)Quote

Site mentions 'Ask Linagora for a paid SaaS account' with no price stated; appears quote-based.

OBM