First connect to Office 365

Connect to O365

$LiveCred = Get-Credential

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $LiveCred -Authentication Basic -AllowRedirection

Import-PSSession $Session



Set-Mailbox -Identity mailbox -Type:Shared

Set-Mailbox mailbox -ProhibitSendReceiveQuota 10GB -ProhibitSendQuota 9.75GB -IssueWarningQuota 9.5GB


If your mailbox keeps getting converted back to user mailboxes you may need to try this –



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