LittleYellowBoat

Hi theo_logical The WhenCreated filter shows when the mailbox was created, and the mailbox is created when the MSOL user is licensed for Exchange Online. So the data returned is the mailbox name, and its creation date. Whether a user has logged on or not is irrelevant. To get the MSOL user creation date: Get-MsolUser | Select UserPrincipalName, WhenCreated and to CSV Get-MsolUser | Select UserPrincipalName, WhenCreated | Export-CSV C:\Temp\MSOLcreation.csv If I have misunderstood what you need, or you need different info, let me know, LYB

Connect to Office 365 with PoSH , the a quick down and dirty way would be: Get-Mailbox | Select Name, WhenCreated | Export-CSV C:\Temp\Mailboxcreation.csv Remember to change the file save path if required. LYB