eOne looks at Reason’s to Upgrade from Integration Manger. I’ve got quite a few more but these will do for now.
The eOne Dynamics GP and CRM Blog: Reason’s to Upgrade from Integration Manger
Microsoft & the GP EcosystemInstall, Upgrade & AdminDevelopment & Integration
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.