Blog Post

Exchange Team Blog
3 MIN READ

Changes to File Types Blocked in Outlook on the web

The_Exchange_Team's avatar
The_Exchange_Team
Icon for Microsoft rankMicrosoft
Sep 25, 2019
Updates: May 2, 2022: We will also be blocking .application, .bgi, .img, .iso and .cab starting with end of May 2022 March 6, 2020: We will also be blocking .apk and .appx beginning April 2020....
Updated May 02, 2022
Version 14.0
announcements
exchange
exchange online
office 365
OWA
security
transport
Red Flag's avatar
Red Flag
Iron Contributor
Jul 28, 2020
When editing the default OWA policy - step by step as described in the article: https://techcommunity.microsoft.com/t5/exchange-team-blog/changes-to-file-types-blocked-in-outlook-on-the-web/ba-p/874451, Exchange "Cannot process argument transformation on parameter 'Identity'".
 
Any better docs to share or I'm the only one who gets the issue?

$policy = Get-OwaMailboxPolicy OwaMailboxPolicy-Default
$blockedFileTypes = $policy.BlockedFileTypes
$blockedFileTypes.Remove(".mag")
Set-OwaMailboxPolicy $policy -BlockedFileTypes $blockedFileTypes
 
Cannot process argument transformation on parameter 'Identity'. Cannot convert the "OwaMailboxPolicy-Default" value of
type "Deserialized.Microsoft.Exchange.Data.Directory.SystemConfiguration.OwaMailboxPolicy" to type
"Microsoft.Exchange.Configuration.Tasks.MailboxPolicyIdParameter".
    + CategoryInfo          : InvalidData: (:) [Set-OwaMailboxPolicy], ParameterBindin...mationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Set-OwaMailboxPolicy
    + PSComputerName        : outlook.office365.com