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Share file in O365 group to external user?
It doesn't seem possible to share a single file (or folder) within an Office 365 group with an external user without adding the user as a guest top the complete group. (I guess this sharing is disabl...
Changes are coming to fix this. Check the following thread, and look for replies from Sahil Arora.
You can already share a Group site without having to add the user as Guest user in the Group