If you don’t want to use Exchange Management Console, you can use Powershell:

Set-ExchangeServer -Identity '%Name%' -ProductKey '%ProductKey%'

So simple but important command for me :) You need to restart “Information Store” service.

An easy way to enable Outlook Anywhere on Microsoft Exchange Server 2010 with Powershell:

Enable-OutlookAnywhere –ExternalHostname ‘mail.yusufozturk.info’ –SSLOffloading $false
-DefaultAuthenticationMethod ‘Basic’

You can set authentication method as Basic or NTLM.