Microsoft blocks Outlook from sending two more file types over security concerns
- Microsoft will block .msix and .msixbundle email attachments in New Outlook and Outlook Web
- Change aims to reduce malware delivery through application package files sent via email
- Organizations relying on these formats must explicitly allow them before rollout begins
Users of New Outlook for Windows and Outlook on the Web in Exchange Online will no longer be able to download email attachments of two file types: .msix, and .msixbundle, Microsoft has confirmed, saying it’s for the users’ own safety.
“To enhance security in Outlook on the web and new Outlook for Windows, we are updating the default list of blocked file types in OwaMailboxPolicy,” a newly released advisory reads.
“As part of this update, the .msix and .msixbundle file types will be added to the BlockedFileTypes list in the default OWA Mailbox policy and any custom policies created in your tenant.”
What are .msix and .msixbundle files?
MSIX is a...
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