admin$objUsers = get-mailbox -ResultSize Unlimited | select UserPrincipalName
#Iterate through all users
foreach ($objUser in $objUsers)
{
#Connect to the users mailbox
$objUserMailbox = get-mailboxstatistics -Identity $($objUser.UserPrincipalName) | Select LastLogonTime
#Prepare UserPrincipalName variable
$strUserPrincipalName = $objUser.UserPrincipalName
#Check if they have a last logon time. Users who have never logged in do not have this property
if ($objUserMailbox.LastLogonTime -eq $null)
{
#Never logged in, update Last Logon Variable
$strLastLogonTime = “Never Logged In”
} else {
#Update last logon variable with data from Office 365
$strLastLogonTime = $objUserMailbox.LastLogonTime
}
#Output result to screen for debugging
Write-host “$strUserPrincipalName : $strLastLogonTime”
}