What is xRM? xRM is basically an application that is built on top of the Microsoft Dynamics CRM platform. This makes Microsoft Dynamics CRM a customizable asset to any business.
Why xRM? Using the Microsoft Dynamics CRM platform not only allows for several in-the-box entities and applications for immediate use, it also features a strong security model, workflow capabilities, reporting and Office integration.
Portal xRM can provide your business with a custom website that integrates with Microsoft Dynamics CRM. Custom forms can gather information and automatically update in Microsoft Dynamics CRM. Web pages can retrieve lists to display information from CRM.

PortalXRM Explained