OBM is a free messaging and collaboration platform useful for just a couple to many thousands of… OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.
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OBM
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| # | Image | App Name | Features | Platforms | Price | Website Link |
| 1 |  |
Microsoft Office 365 | Web | Software as a Service (SaaS) | Commercial | Website |
| 2 |  |
Zimbra Collaboration Suite | Web | Self-Hosted Linux |
Freemium | Website |
| 3 |  |
iMail | Self-Hosted Windows |
Commercial | Website | |
| 4 |  |
Zoho | Web | Commercial | Website | |
| 5 |  |
Microsoft Exchange Server | Web | Windows | Commercial | Website |
| 6 |  |
Horde | Web | Self-Hosted | Free | Website |
| 7 |  |
SOGo |
Web Thunderbird |
Cloudron Linux |
Freemium | Website |
| 8 |  |
Kolab Community | Web | Self-Hosted Linux |
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| 9 |  |
iRedMail | BSD Self-Hosted Linux |
Freemium | Website | |
| 10 |  |
Kolab Now |
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Software as a Service (SaaS) | Commercial | Website |