To scan the servers / PCs using the MAP Toolkit, you will need an AD user with administrative privileges on all the components to scan.
This will be enough if you need a report of what’s installed on a series of servers/clients, their roles, and all “local” related queries, or basic AD queries.
For Exchange related queries, you will need an Exchange Admin or Domain Admin.
Please refer to the following TechNet page for the full requirements:
Azvise 