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MC244888 – We are introducing a new Excel Trust Center setting to further restrict the usage of Excel 4.0 (XLM) macros. As part of this rollout, a registry key is being retired, and a group setting is being renamed.
Key points
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How this will affect your organization
XLM macros is a legacy macro language that was made available to Microsoft Excel in 1992, prior to the introduction of Visual Basic for Applications (VBA) in 1993.
This update enables users to choose only a more secure state by providing more granular controls for macros in Excel, if you have not disabled end-user ability to manipulate macro settings in Excel.
Updated Group Policy “Macro Notification Settings”
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This new setting, Enable XLM macros when VBA macros are enabled, can be activated via a checkbox within Macro Settings in the Trust Center. It is enabled by default; this update has no impact to existing macro settings configurations.
What you need to do to prepare
As part of this update, the following registry key is being retired and will no longer function as of April 30, 2021.
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Excel\Security\XLM
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