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 an app in the Office & Productivity category. There are more than 10 alternatives to OBM for a variety of platforms, including the Web, Linux, Self-Hosted solutions, Windows and Mac. The best alternative is Zoho. It's not free, so if you're looking for a free alternative, you could try Zimbra Collaboration Suite or SOGo. Other great apps like OBM are Microsoft 365 (Paid), iRedMail (Freemium, Open Source), Horde (Free, Open Source) and Kolab Community (Freemium, Open Source).
- 22 alternatives
- Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. View 42 alternatives to Zimbra Collaboration Suite
- Freemium • Open Source