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The data you get from Get-MailboxStatistics is incorrect anyway, you shouldn't use that. Use the built-in reports from the O365 admin center, or the corresponding Graph endpoints. Or the recently introduced /signInActivity endpoint, but that's per user also: https://docs.microsoft.com/en-us/graph/api/resources/signinactivity?view=graph-rest-beta
Thanks for the feedback, obtain the data via the Graph API is fine, the problem is that we need to make a call for each user rather than requesting the info for all users. Is there anyway to do this in bulk and obtain the stats for all users in our Org? The root issue for us is that we need to make a call for each user.
Use the Graph call for the report then, it will give you the data for all users.
I presume this would be a call to the auditLogs/signIns endpoint - but this looks like it's only in beta. Is there the same in pro?
nimby You could compute the last active time based on the data available from graph endpoint.
https://docs.microsoft.com/en-us/graph/api/reportroot-getoffice365activeuserdetail?view=graph-rest-1.0
