Microsoft Dynamics CRM Editions and Licensing

Editions:
Microsoft Dynamics CRM 4.0 Workgroup. This edition is limited to five, or fewer, users. It can be installed on Microsoft Windows Small Business Server 2003 R2 Enterprise Edition, any of the supported Windows Server 2003 editions, or Windows Server 2008 (when available). This version is limited to a single organization and a single computer that is running Microsoft Dynamics CRM Server.

Microsoft Dynamics CRM 4.0 Professional. This edition has no user limit and is limited to a single organization, but Microsoft Dynamics CRM 4.0 Professional can be installed on more than one computer in the same deployment.

Microsoft Dynamics CRM 4.0 Enterprise. There is no user limit for this edition. Additional features include support for multiple organizations, multiple server instances, and role-based service installation. Role-based services let you increase performance by installing component services on different computers.