The Excel 2000 SR-1 Update: Macro Modification Security addresses a vulnerability that could allow malicious code to run in a Microsoft Excel file without warning. In an Excel 2000 file, it is possible for the macros to be modified in such a way that a macro can run with no warning issued. This could cause damage to data or allow unauthorized retrieval of data from your system when you visit a Web site or open an e-mail message. After applying this update, a warning will appear before opening an Excel file containing macros.
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