Is it possible to setup SharePoint Online Search to index Office 365 elements (like Planner plans, tasks, OneDrive, groups calendars, groups emails / conversations...)? If so, is there any documentation about this?
It is possible to setup SharePoint Online Search to index Office 365 elements. Below is a link which provides you the new feature of search
You will get three search sources here:
Links & attachments in Email
I dint get any specific link which provides all elements in single search. But hope this fixed maximum of your requirements.
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