A. 1. Update the App: Ensure that you have the latest version of Microsoft To Do installed. Go to the App Store, search for Microsoft To Do, and tap 'Update' if available. 2. Restart Your Device: Sometimes, simply restarting your iPhone can resolve app crashes. Press and hold the power button until you see the 'slide to power off' option, then slide to turn off. After a few seconds, turn it back on. 3. Clear App Cache: Go to Settings > General > iPhone Storage, find Microsoft To Do, and tap 'Offload App'. This will clear the cache without deleting your data. Reinstall the app afterward.

B. 4. Reinstall the App: If the app continues to crash, uninstall it by pressing and holding the app icon until it wiggles, then tap the 'X'. Reinstall it from the App Store.