Collaboration in Office 365 : site mailbox and external users (forget it)

I really love the concept of the site mailbox in SharePoint 2013 and SharePoint Online : it is a kind of newsfeed for you team site e-mail (& attached documents) as illustrated here; however in O365 external users cannot use/access the Site Mailbox; if they try they will get this message:



So if you want to keep your site mailbox (just for the O365 internal users), the risk is that you will have a hidden(to external users) information silo somewhere, which goes against the idea of collaboration. Dangerous.


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