# 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 WebChange aims to reduce malware delivery through application package files sent via emailOrganizations relying on these formats…

- **Source:** [TechRadar](https://www.techradar.com/pro/security/microsoft-blocks-outlook-from-sending-two-more-file-types-over-security-concerns?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6ac690a3f6d479bf38a79d1a)
- **Published:** 2026-10-07
- **Category:** Apps
- **Tags:** #microsoft #windows
- **Canonical:** http://localhost:4321/a/6ac690a3f6d479bf38a79d1a

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_GearOpen's distilled summary. The full original article is published at TechRadar (source link above); GearOpen does not republish the source's full text._