In this post I like to highlight a highly handy feature update “B2B sync” regarding Microsoft OneDrive for Business for “inter-org collaboration”.
B2B sync enables users to sync not only OneDrive for Business and SharePoint Online data of their organization but of other organizations, too! This means that your collaboration experience becomes much better because if you are a guest of an external Team, which is of course hosted in another Office 365 tenant, you’ll be able to sync files from this SharePoint Online, too.

Conclusion, opinion and summary
I like this feature because this enables you to have much more synced data exchange and collaboration with external parties also having Office 365 incl. SharePoint Online and OneDrive for Business. So, you do not need to down-/upload files via browser.
Additional resources
- B2B Sync [Microsoft Roadmap Item ID 33413]
- SharePoint and OneDrive integration with Azure AD B2B (Preview)
- B2B Sync [How-To, requirements, configuration …]
- SharePoint Roadmap Pitstop: July 2019