I BET you cannot rename your Excel Sheet 'HISTORY'

Описание: Did you know some words are forbidden sheet names in Excel? One of the most surprising is the word “History.”

When I tried renaming a sheet to History, Excel instantly refused. The reason is that Excel has a set of reserved names it uses internally, and “History” is one of them. These words can’t be used as worksheet names to avoid conflicts with Excel’s internal processes.

Your file isn’t broken — it’s just Excel protecting itself. This is one of those hidden Excel rules most users never discover until they run into it. So after these discoveries some questions arise.
✅ Why Excel blocks the word History
✅ What reserved names mean in Excel
✅ How to avoid errors when renaming sheets

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