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 ...

Select all the relevant cells, and in the Data tab, click the main part of the split "Data Validation" button. Then, click ...

Microsoft has started looking into a problem that is preventing users from opening some Excel file attachments with non-ASCII ...

If you are experiencing the Download did not complete error message in Microsoft Excel, here are the troubleshooting methods to fix the error: Perform preliminary ...

Excel for Windows now shows clear, descriptive error cards that explain issues and offer fixes, making formula ...

Excel data loss error Many users have now reported receiving the error m message "File error: data may have been lost" when attempting to open Excel files under ...

The cause appears to be the use of non-ASCII characters in file names. Microsoft describes it like so: “Any user may be ...

As spotted by Bleeping Computer, Microsoft has published a new service alert related to Outlook. Labelled as issue EX1189359 and titled "Users may be unable to open Excel files attached to email ...