When using the Dynamics CRM Campaign Integration module to connect Microsoft Dynamics CRM 2011 or later, Sitecore User Manager would only display a maximum of 5000 CRM contacts.
This issue is related to the limitation of the Microsoft Dynamics CRM which limits the total number of contacts returned from a list using the TotalRecordCountLimit setting. The default value of the setting is 5000.
When the number of results exceeds the value, CRM returns information in a format that the Sitecore User Manager application is not able to properly display and only shows the total of 5000 users.
This applies to Dynamics CRM Campaign Integration 2.0 and later versions
For self-hosted Microsoft CRM installation, you can increase the value of the TotalRecordCountLimit CRM setting as a workaround.
Note that this may lead to performance issues. To learn more about the TotalRecordCountLimit setting, refer to the following page:
What does the TotalRecordCountLimit field control in the MSCRM_CONFIG database.
For Microsoft CRM Online, there is no workaround.