MC395211 – Outlook to block new attachment file types to improve security (archived)

Outlook logo

check before: 2022-07-12

Product:

Microsoft 365 Apps, Outlook

Platform:

Android, iOS, Mac, Web, World tenant

Status:

Change type:

User impact, Admin impact

Links:

Details:

As we continually assess to improve security, we are adding additional attachment file types to the list of BlockedFileTypes.
[When this will happen:]
We will begin rolling out early July and expect to complete by late July.

Change Category:
XXXXXXX ...

Scope:
XXXXXXX ...

Release Phase:

Created:
2022-06-28

updated:
2022-08-27

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changes*

DatePropertyoldnew
2022-08-27MC prepareThere are several ways to send and receive a blocked file. You can save the file to the cloud and send a link to the file, use a file compression utility like WinZip, or even rename the file with another extension, then have your recipient change the name back to the original name after they receive the file.
[What file extensions will be added to the BlockedFileTypes list with this change?]

Outlook Win32: ".cab",
Outlook on Web: "application", "bgi", "img", ".iso", "cab"
New Outlook on Mac, Outlook Android, Outlook iOS: ".appref-ms", ".cdxml", ".mht", .mhtml", ".pssc", ".udl", ".wsb" ".cab"
[Where is the fu​ll list of Outlook client block file types?]

Outlook Win32: Blocked attachments in Outlook (microsoft.com)
Outlook on Web: Changes to File Types Blocked in Outlook on the web - Microsoft Tech Community
New Outlook on Mac, Outlook Android, Outlook iOS
https://support.microsoft.com/en-us/office/blocked-attachments-in-outlook-434752e1-02d3-4e90-9124-8b81e49a8519
https://support.microsoft.com/office/blocked-attachments-in-outlook-mobile-759ec27e-a7e6-432d-b319-cc446c165225?storagetype=live
https://techcommunity.microsoft.com/t5/exchange-team-blog/changes-to-file-types-blocked-in-outlook-on-the-web/ba-p/874451
There are several ways to send and receive a blocked file. You can save the file to the cloud and send a link to the file, use a file compression utility like WinZip, or even rename the file with another extension, then have your recipient change the name back to the original name after they receive the file.
[What file extensions will be added to the BlockedFileTypes list with this change?]

Outlook Win32: ".cab",
Outlook on Web: "application", "bgi", "img", ".iso", "cab"
New Outlook on Mac, Outlook Android, Outlook iOS: ".appref-ms", ".cdxml", ".mht", .mhtml", ".pssc", ".udl", ".wsb" ".cab"
[Where is the fu​ll list of Outlook client block file types?]

Outlook Win32: Blocked attachments in Outlook (microsoft.com)
Outlook on Web: Changes to File Types Blocked in Outlook on the web - Microsoft Tech Community
New Outlook on Mac, Outlook Android, Outlook iOS
ps://support.microsoft.com/en-us/office/blocked-attachments-in-outlook-434752e1-02d3-4e90-9124-8b81e49a8519
ps://support.microsoft.com/office/blocked-attachments-in-outlook-mobile-759ec27e-a7e6-432d-b319-cc446c165225?storagetype=li
ps://techcommunity.microsoft.com/t5/exchange-team-blog/changes-to-file-types-blocked-in-outlook-on-the-web/ba-p/87445

*starting April 2022

Last updated 4 weeks ago

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