Learn how to fix Microsoft Excel not opening Windows 11 with Safe Mode, Office Repair, add-in checks, file permissions, and Excel file repair.

Give yourself a cleaner start to next week by fixing five Excel frustrations you've probably learned to accept.

When I opened the Excel file I inherited from my predecessor, the cells were filled with bright red #REF! and #VALUE!

After updating to iPadOS 26, I noticed that Microsoft Excel suddenly stopped working the way it used to. At first, it would freeze when opening certain files. Then, it began crashing without warning.

On 8, Microsoft rolled out KB5002914 for Excel, but it apparently has a bug that makes it impossible to copy and paste.