This script will demonstrate how to generate a report, save it to a CSV file, which provides a list of all the users who have not logged in for at least 30 days. With this information you can then take the appropriate action to remove unused mailboxes.
#Create a list of inactive Exchange mailboxes and save to CSV. #To begin, you will need to load the Azure Active Directory module to be able to run the report. Import-Module MSOnline #Capture administrative credential for future connections. $credential = Get-Credential #Establishes Online Services connection to Azure Active Directory. Connect-MsolService -Credential $credential #Creates an Exchange Online session. $ExchangeSession = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://outlook.office365.com/powershell-liveid/" -Credential $credential -Authentication "Basic" -AllowRedirection #Import session commands. Import-PSSession $ExchangeSession #This command will generate a list of users inactive for 30 days, or longer, and export to a CSV file. Get-StaleMailboxDetailReport | Sort username -Unique | SELECT TenantName, UserName, WindowsLiveID, LastLogin, DaysInactive | Export-Csv c:\reports\StaleUsers30.csv
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