New External Sharing Experience - when is a Guest account created?

[Franck Marteaux]

hi there,

we are testing the sharing configuration in OdFB and SPO.

We configured "Users can invite new an existing guests".

In ODfB i first share a file with user abc@outlook.com. He gets the invitation and then the access code.
No Guest account is created.

Then i share another document with user abc@fabricam.com which is an external O365 User. This user also gets the invitation, and then the access code.

Now a Guest account is created for this user.

What is the exact algorithm behind this. are Guest users only created for O365 (School and Work Accounts)? Can I prevent that Guest Users are created at all for users invited by standard users?

thanks,
Franck

[#2]

It's explained in this article: https://docs.microsoft.com/en-us/sharepoint/what-s-new-in-sharing-in-targeted-release

If you have additional questions, look at this recent thread and ask them directly to Stephen.