Office Apps Crashing

Fix Microsoft To Do Crashing When Using Group By Feature

Maira Mehtab Sep 20, 2026 869 views

Question details

The user experiences consistent application crashes in Microsoft To Do when applying the Group by function to the Flagged email and All lists.

Product: Microsoft To Do
Device & OS: not provided
Scenario: Attempting to organize tasks by grouping flagged emails and all lists.
Observed behavior: The Microsoft To Do application crashes 100% of the time on both desktop and web versions when the Group by feature is utilized on these specific lists.

Before you start

Verify if the Microsoft To Do crash occurs on a specific device or across multiple platforms by testing it on both the desktop application and the web browser version.

Solution 1Recommended

Avoid Group By on Affected Lists and Report to Microsoft

Since this is a consistent reproducible bug across both web and desktop versions, the best immediate action is to avoid the trigger and submit a detailed bug report.

This specific crashing issue is a software bug related to how Microsoft To Do handles data rendering for aggregated lists like Flagged email and All lists.

Because it occurs across multiple PCs, Edge, and the desktop app for Office 365 Business Premium accounts, local troubleshooting steps like reinstalling will not fix it. A patch from Microsoft is required.

Stop Using Group By on Affected Lists

Avoid using the 'Group by' feature on the 'Flagged email' and 'All' lists to prevent the application from immediately crashing.

Document the Issue Details

Document the exact steps that lead to the crash, noting your account type (Office 365 Business Premium), list names, and reproduction frequency.

Gather Version Information

Note down your current application version for the desktop app and the browser version (such as Microsoft Edge) used when accessing the web app.

Submit a Bug Report

Contact Microsoft To Do support through the Microsoft 365 admin center or the application's help menu, and provide the collected reproduction steps.

Temporary Workaround: Until Microsoft releases a patch for this specific bug, organizing tasks in these specific lists must be done using standard sorting or search features instead of the Group by function.

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Frequently Asked Questions

Why does Microsoft To Do crash only on specific lists like Flagged email?

The crash is often caused by a software bug in how Microsoft To Do aggregates and renders data for specialized smart lists like Flagged email and All lists. When the Group by function is applied, the application fails to process the data correctly, leading to an immediate crash.

Does reinstalling the Microsoft To Do desktop app fix the Group By crash?

Because this specific bug occurs consistently across multiple PCs, the desktop application, and the web browser version, reinstalling the application is highly unlikely to resolve the issue. It requires an official update from Microsoft.

How can I organize my Flagged emails without using the Group By feature?

As a temporary workaround, you can manually sort the list by date or importance, or use the built-in search filters to locate specific flagged tasks until the grouping bug is permanently resolved.

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