Here are some one-liners to get various Office 365 Groups reporting/statistics.
You can for example see last activity date on SharePoint, Inbox and Teams.
Remember to log in to Exchange Online and SharePoint Online in the PowerShell session before running these one-liners.
#Check Office 365 mailbox activity, all mailbox activity are stored in the inbox Get-MailboxFolderStatistics -Identity IT -IncludeOldestAndNewestItems -FolderScope Inbox
#Check teams activity, all channel chat will be stored in the ConversationHistory Get-MailboxFolderStatistics -Identity IT -IncludeOldestAndNewestItems -FolderScope ConversationHistory
#Example of group not enabled for Teams Get-MailboxFolderStatistics -Identity "Innovation Corner" -IncludeOldestAndNewestItems -FolderScope ConversationHistory Get-MailboxFolderStatistics -Identity "Innovation Corner" -IncludeOldestAndNewestItems -FolderScope Inbox![]()
#Check SharePoint activity, see if there are SharePoint site created and when last activity (Get-SPOSite -Identity ((Get-UnifiedGroup IT | Select-Object -Property *).SharePointSiteUrl)).LastContentModifiedDate | Get-Date -Format yyyy.MM.dd
#Check if ownerless Get-UnifiedGroupLinks IT -LinkType owner