http://msdn2.microsoft.com/en-us/library/bb986981.aspx

Microsoft Dynamics Mobile consists of a mobile sales application and tools to enable customers and partners to create and run mobile business solutions. In 2008, the release of Microsoft Dynamics NAV 5.0 SP1 contains the integration components for Microsoft Dynamics Mobile 2008. Microsoft Dynamics Mobile 2008 also supports Microsoft Dynamics NAV 4.0 SP3.
The following documentation is available:

• Microsoft Dynamics Mobile Development Tools Installation and Configuration Guide
• Mobile Framework Developer Guide
• Mobile Orchestration
• Mobile Server Administration
• Mobile Sales in Microsoft Dynamics AX 4.0
• UserRole Schema Reference
• Reference