AX among other Dynamics MSDAX

Microsoft bought four independent ERP packages for small to medium business over the years. Microsoft now markets all four + CRM under the Dynamics branding. The ERP packages are AX (Axapta), Great Plains, Navision and Soloman. These four ERP's fit into various customer requirements better or worse depending on what your business requirements are. AX is the choice if a very high degree of customization is required by the customer. The others, not so much.

 AX is for EnterpriseMicrosoft Great Plains is TIER 2 application whereas Microsoft AX is TIER 1. TIER 2 means for

Small and Medium Size Enterprises
 and TIER 1 means Enterprise. Enterprise means where employee count is more than 20,000 and more than 200 concurrent users.