[appsuite-announce] Open-Xchange releases Public Patch 2026-08-13 for OX App Suite v8.49, OX App Suite v8.50 and OX App Suite v8.51

[Open-Xchange App Suite Maintenance Announcements]

Dear Customers of Open-Xchange,

This is an urgent patch you need to install as soon as possible to prevent calendar data loss in certain cases. It provides an update for OX App Suite v8.49, OX App Suite v8.50 and OX App Suite v8.51. The Public Patch Release is available for all customers with a valid Open-Xchange license.

Please visit the following link to check if you are affected: https://documentation.open-xchange.com/appsuite/releases/8.51/noteworthy/calendar-purge-selfcheck.html

Shipped versions with latest Helm Chart OX App Suite v8.49: v8.49.538
- Open-Xchange App Suite Middleware (Backend) v8.49.141 - v8.49.157

Fixes, software change requests and further details to the OX App Suite v8.49 in this release include:
- https://documentation.open-xchange.com/appsuite/releases/8.49/noteworthy/00_index.html
- https://documentation.open-xchange.com/appsuite/releases/8.49/changelogs/middleware.html

Shipped version with latest Helm Chart OX App Suite v8.50: v8.50.694
- Open-Xchange App Suite Middleware (Backend) v8.50.162 - v8.50.180

Fixes, software change requests and further details to the OX App Suite v8.50 in this release include:
- https://documentation.open-xchange.com/appsuite/releases/8.50/noteworthy/00_index.html
- https://documentation.open-xchange.com/appsuite/releases/8.50/changelogs/middleware.html


Shipped version with latest Helm Chart OX App Suite v8.51: v8.51.808
- Open-Xchange App Suite Frontend v8.51.3
- Open-Xchange App Suite Middleware (Backend) v8.51.123 - v8.51.153

Fixes, software change requests and further details to the OX App Suite v8.51 in this release include:
- https://documentation.open-xchange.com/appsuite/releases/8.51/noteworthy/00_index.html
- https://documentation.open-xchange.com/appsuite/releases/8.51/changelogs/ui.html
- https://documentation.open-xchange.com/appsuite/releases/8.51/changelogs/middleware.html


Technical Documentation, Deployment Information, Requirements and Support Commitment

For details of how to install and update OX App Suite v8, please refer to the instructions provided at: https://documentation.open-xchange.com/appsuite/operation-guides/

Best regards,
Your Open-Xchange Team

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Open-Xchange AG, Erftstraße 15–17, 50672 Cologne, District Court Cologne HRB 95366
Managing Board: Andreas Gauger, Dirk Valbert
Chairman of the Board: Dr. Paul-Josef Patt

European Office:
Open-Xchange GmbH, Olper Huette 3, D-57462 Olpe, Germany, District Court Siegen, HRB 8718
Managing Director: Manuel Engel

US Office: 
Open-Xchange Inc., 3000 El Camino Real, Building 4, Suite 200, Palo Alto, CA 94306, USA
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