Editions for On-premises Deployments
- Microsoft Dynamics CRM Server 2011. There is no user limit for this edition. Additional features include support for multiple organizations, multiple server instances, and separate role-based service installation. Role-based services let you increase performance by installing component services on different computers.
- Microsoft Dynamics CRM Workgroup Server 2011. This edition is limited to five, or fewer, users. This version is limited to a single organization and a single computer that is running Microsoft Dynamics CRM Server 2011.
Client Access License Types
Microsoft Dynamics CRM Online
With Microsoft Dynamics CRM Online, you get powerful CRM capabilities and features delivered as a cloud service from Microsoft, providing instant-on, anywhere access, and predictable pay-as-you-go pricing.
My above blog is based on Microsoft's Official information.
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