Hello Rafael Thank you for the quick reply. You are correct in assuming that I was referring to the B2B invitation acceptance flow. With regard to what features external users have available, I have been looking at this article: https://support.office.com/en-us/article/external-sharing-overview-c8a462eb-0723-4b0b-8d0a-70feafe4be85?ui=en-US&rs=en-US&ad=US And I have also corresponded with MS technical support. My understanding is that when I share a folder or a file with an external user, who is not part of the AAD, that user does not get added as a guest. Every time the user logs in, he or she receives a one-time code to sign in even if he or she is using a Microsoft Account (or an organizational account such as it is right now). When that happens, the user is treated as if he or she is anonymous and gets the same features as an anonymous user and thus does not have the right to create a new document in the browser, etc. And let me just add to that, while I'm at it: It has been a big nuisance to our users, that external users cannot open shared documents in their existing desktop versions of Office (and that they cannot sync files to their own computers). Is this something we can expect being remedied as well? At this point the above article is hinting that we need to assign licenses to our guest users, in order for them to open documents in their existing Office applications (which they have already paid for). This, frankly, does not seem quite fair to me. Thank you for listening!