Why the KB5002700 Update Breaks Office 2016 and How to Fix It

KB5002700 Security Update Overview

Microsoft released KB5002700 for Windows 10 and Windows 11 to protect Office 2016 against new threats. Instead of improving reliability, the patch makes Word and Excel crash on launch or when creating new documents, causes Outlook calendar view failures (especially with the "show weather" option), and increases the risk of data loss when the programs become unresponsive.

Widespread and Severe Issues

Testing by Windows Latest and numerous user reports on Reddit and X (formerly Twitter) confirm that the problems are reproducible across many system configurations. Users describe Word and Excel terminating instantly, Outlook crashing when opening the calendar view, and unsaved work being lost after forced shutdowns. The community’s complaints have grown steadily, making KB5002700 one of the most negatively received patches.

Temporary Fixes and Workarounds

Disable the Adobe PDF Maker COM add‑in (via safe mode) to reduce Word crashes.

In Outlook, go to File → Options → Calendar and turn off the "Show weather forecast" option.

These measures may alleviate symptoms but often do not fully resolve the instability.

Complete Uninstall Procedure

The only reliable solution is to remove KB5002700 entirely. Because the update installs silently through Windows Update, it does not appear in "Programs and Features". Users must:

Open the Registry Editor and locate the Office 2016 GUID under the appropriate update key.

Download the original KB5002700 package from the Microsoft Update Catalog.

Extract the .msp file from the package.

Run a command such as msiexec /uninstall {GUID} /quiet (replace {GUID} with the actual Office 2016 identifier) to uninstall the patch.

Reboot the computer; Office 2016 should return to normal operation.

Conclusion

Although KB5002700 was intended to enhance security, insufficient testing caused major stability issues for Office 2016 users, especially in enterprise environments that still rely on the legacy suite. Administrators must weigh the security benefits against the risk of operational disruption and proceed with caution when applying critical updates.