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Delete OWA signatures

Problem:

You need to remove OWA signatures of multiple, individual users at once.

Applies to:

  • Microsoft Exchange Server 2010, 2013
  • Microsoft Exchange Online (Office 365)

Solution:

Before running the commands from the below solution, please ensure that you are logged in as a user who is a direct member of the Organization Management and Domain Admin groups (Global Administrator in the case of Exchange Online).

Using Windows PowerShell you can delete all users' OWA signatures. To do that follow the steps below:

  1. Connect to your Exchange Server:
  2. Execute the below PowerShell cmdlet sets:
$mailboxes = Get-Mailbox -ResultSize unlimited
​$mailboxes | foreach { Set-MailboxMessageConfiguration -identity $_.alias -SignatureHtml "" }

Supplement SignatureHtml with SignatureText or SignatureTextOnMobile for other signature formats your users might have configured.

  1. You can also disable OWA signature auto adding feature without actually removing signatures (or combine the below command with the above to do both):
$mailboxes = Get-Mailbox -ResultSize unlimited
​$mailboxes | foreach { Set-MailboxMessageConfiguration -identity $_.alias -autoaddsignature $false }

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