Our office currently upgraded our email to Office 365. I've found however if we are only using the Outlook mobile app connected to our Office 365 account then I can't see its calendar in my RingCentral mobile app for web meetings, etc.
At the moment as a work around I have the Samsung Email app configured with my office 365 account and just have emails not syncing, this way I can see my calendar in the RingCentral mobile app and then are using the Outlook mobile app for emails.
Integration between the Outlook mobile app and the RingCentral app would be soooo useful! I can add my Office 365 calendar on the RingCentral desktop app.