I have written before, and will say again, that Microsoft Excel does not have security. It does actually have some security features but most users don't know about them and, if they do, they are frequently not implemented.

In any case, as Microsoft has explicitly stated, the security features in Excel are not actually there to provide security but to make life simpler for users. For example, you can hide worksheets from users so as not to confuse them and you can apply what locking is available for the same reason: so that users just focus on what they need to do and not on other stuff.

At The Register.

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