If Excel Online is not working and you see errors Couldn't Open the Workbook, or Request Was Taking Too Long, then see this post for the fix.

If you see The file couldn't open in protected view error while opening Microsoft Excel, the fixes listed in this post will help you.

ACCELERATE A SLOW-OPENING MASSIVE EXCEL FILE My work requires the use of several very large Excel files, and they take forever to open. In fact, they even take a long time to save and close. I’ve ...

Excel files have nothing to worry about, though, because CSVs can't replace them, and they're not even trying to do that. Check out our in-depth guide to CSV files below to know what to do the ...

While it is technically possible to open an Excel file in Notepad, this is not a good idea. Excel files are binary files that contain complex formatting and data structures. When you open an Excel ...

Learn how to use a Microsoft 365 setting to choose whether to open files in the online or desktop app, giving you full control for each file.

To recover the file, open Excel once your computer is working properly. A Document Recovery pane should appear with all unsaved Excel files listed (see the screenshot below). Choose the file that you ...

Numbers has the ability to open Excel files so you can work on them. You can also export spreadsheets in Numbers so that they are compatible with Excel.