Set-ExecutionPolicy RemoteSigned
$LiveCred = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
Import-PSSession $Session
Get-MailboxFolderStatistics username@domain.com | Select Identity, ItemsInFolder
Search-Mailbox -id username@domain.com -DeleteContent -force