SAP B1 Licence Requirements
CRM for Outlook client technically does not require an SAP Business Licence in order to just view data on the context tab. If you want to use the "My data" tab or use some of the creation/update features (Create license, update business partner, add link, create service call etc.) you need a SAP License. This can be Pro, Limited or Indirect Access (user-based or instance-based), although a limited license might not have all functions available.
The user that you set up CRM for Outlook server component with needs to be at least a user with super-user access. Using a limited license here is not recommended and not supported, but Pro or Indirect Access should work fine and comply with SAP rules.
If your SAP Business One installation has bespoke user permissions set up (e.g. with the B1 Usability Pack) then these permissions will not be carried across into CRM for Outlook. Instead, these permissions can be set up on the Boyum portal.
The following are screenshots of the options available for these permissions: