When sharing files or folders you must explicitly list each user or group you would like to share with. The share option 'Anyone with the link can...' is disabled. This does not restrict whom you can share with. You can still share files and folders with users outside of the A-State organization, however, you have to explicitly list the user or group you would like to share with.
Syncing between OneDrive Business accounts and OneDrive Personal accounts is not supported by Microsoft at this time. You can still share with users that only have Personal OneDrive accounts (accounts that are not tied to an organization), however, the user will only be able to access the shared file or folder from a web browser.