Office 365 – Find user by email address or alias

Step 1:

$LiveCred = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
Import-PSSession $Session 

Step 2:

Get-Mailbox -Identity * | Where-Object {$_.EmailAddresses -like 'SMTP:support@domain.nl'} | Format-List Identity, EmailAddresses