Outlook
Microsoft · current 20326.20100
The current version of Outlook is 20326.20100 (as of 19/08/2026). patchletter checks the official source daily and emails you every new release.
Actively exploited vulnerabilities
The US cybersecurity agency CISA lists these vulnerabilities in its catalog of Known Exploited Vulnerabilities. Check your version and patch or mitigate promptly.
- CVE-2024-21413Microsoft Outlook Improper Input Validation Vulnerability
9.8 critical · over the network, without login · CISA deadline was 27 Feb 25
- CVE-2023-35311Microsoft Outlook Security Feature Bypass Vulnerability
7.5 high · over the network, without login, needs user action · CISA deadline was 1 Aug 23
Source: CISA KEV. The CVE is matched to the product automatically — when in doubt, the linked NVD entry applies.
BSI security advisories
Advisories the German BSI (CERT-Bund) published for this product. Whether your version is affected is stated in the advisory itself.
- Microsoft Office Produkte: Mehrere Schwachstellen
WID-SEC-W-2026-2762 · 21 Aug
Outlook at a glance
Microsoft Outlook zählt zu den am weitesten verbreiteten E-Mail- und Kalender-Clients im geschäftlichen Umfeld und ist fester Bestandteil der Microsoft-365- und Office-Suiten. Sysadmins verwalten damit die Anbindung an Exchange Online oder On-Premises-Exchange, konfigurieren Autodiscover, Profile, Add-ins sowie Richtlinien für die zentrale Bereitstellung im Unternehmen.
Das Update-Verhalten hängt vom gewählten Bereitstellungsmodell ab: Über die Microsoft-365-Update-Kanäle werden Funktions- und Sicherheitsupdates laufend ausgerollt, während volumenlizenzierte Office-Versionen einem festen Lifecycle mit definierten End-of-Support-Terminen folgen. Parallel läuft der schrittweise Übergang vom klassischen Outlook hin zum neuen Outlook.
Beim Aktualisieren sollte man auf Kompatibilität von Add-ins, Makros und COM-Erweiterungen achten sowie geänderte Standardeinstellungen und Sicherheitsverhalten prüfen. Ein Testring vor dem breiten Rollout, die Kontrolle der Kanalzuordnung und das Beobachten von Support-Enddaten für ältere Versionen helfen, Betriebsunterbrechungen zu vermeiden.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| 20326.20100 | STABLE | 19/08/2026 | Release notes → |
| 20228.20190 | STABLE | 12/08/2026 | Release notes → |
| 20228.20158 | STABLE | 07/08/2026 | Release notes → |
| 20228.20124 | STABLE | 07/08/2026 | Release notes → |
| 20228.20110 | STABLE | 07/08/2026 | Release notes → |
| 20131.20154 | STABLE | 07/08/2026 | Release notes → |
| 20131.20126 | STABLE | 07/08/2026 | Release notes → |
Frequently asked questions
- What is the latest version of Outlook?
- Outlook 20326.20100, released 19/08/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the Outlook release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new Outlook updates?
- Free by email: patchletter reports every new release — instantly or bundled as a digest. Unsubscribe anytime with one click.
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[](https://patchletter.com/en/software/outlook)https://patchletter.com/badge/outlook.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
