Turn off WINMAIL.DAT in Office365

article #669, updated 3667 days ago

The widely recommended method, is to connect to the Office365 Exchange server via PowerShell. This may need to be done in PowerShell run as administrator; certainly the first line has to be run thusly, although that one line may have to be run only once per client machine.

Set-ExecutionPolicy Unrestricted

(type Y for Yes)

$LiveCred = Get-Credential

(enter your Office365 administrative credentials)

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
Import-PSSession $Session
Set-RemoteDomain Default -TNEFEnabled $false
Remove-PSSession $Session

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