The mso9.dll apparently is particularly prone to getting corrupted, and it usually causes troubles in PowerPoint, Word and Outlook rather than in Excel. There is a way to repair such corrupted files ...

Do you keep experiencing the #SPILL! error in your Excel worksheets on Windows? This error occurs when the formula you have used is unable to populate results into ...

Here’s how to fix Word, Excel, PowerPoint has run into an error that is preventing it from working correctly problem once and for all. Sometimes, problems occur due ...

Microsoft updates for Excel in January 2026 introduce Agent Mode with Copilot, new import tools, clearer error messages, Power Query on Mac and Web, and Office Scripts automation to ease daily tasks.