Locking a linked workbook
 

I have created an Excel 2003 workbook that does calculations based on a
sharepoint list. I have linked the workbook to the sharepoint list.

However, I have several people that need to review the spreadsheet.
Sometimes, they accidently make changes causing data replication errors.

Is there a way to lock the workbook so people can't update it, but let
sharepoint know the password so it can update the spreadsheet when its opened?
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Thank you! Jenna