Please, improve the protection of Excel spreadsheets
I have found that OpenOffice and LibreOffice can open Excel spreadsheets with password very easily. This seems like a pretty serious problem. I hope you will correct soon. Thank you
Celia Alves commented
Same with Google Drive. As soon as you convert an Excel spreadsheet to google spreadsheets, almost all the information becomes visible: password protected sheets, very hidden sheets, hidden formulas, etc...