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B2B integration limitations with O365

Copper Contributor

Hi.  I have seen information on B2B Guest integration capabilities & restrictions with SharePoint, OneDrive and Teams.

Just wondering what is the current scope of integration and/or restrictions with other O365 components, in particular Exchange.

For example, can a guest user be added to a shared mailbox and send from it?

Similarly, can I delegate calendar management to a guest user?

Cheers, Stuart

2 Replies

This is very good question! Did you get answer to it?
From my colleges I understood it is doable with the Shared Mailboxes. But I didn't get any proof yet unfortunately yet.

Also I am not sure about the rest and features like Calendar Sharing or Teams


Hi Stuart,


Keen to know if you were able to proceed with providing guest user access to EOL Shared mailbox. I am considering a similar solution for my org but not sure whether it would work and more specifically its limitations.