New Update Microsoft Excel now blocking untrusted XLL add-ins by default

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Microsoft says the Excel spreadsheet software is now blocking untrusted XLL add-ins by default in Microsoft 365 tenants worldwide.

The company announced this change in January with a new entry added to the Microsoft 365 roadmap when it entered an initial testing phase by first rolling out to Insiders.

The new feature will be generally available in multi-tenants worldwide by late March after rolling out to all desktop users in the Current, Monthly Enterprise, and Semi-Annual Enterprise channels.

"We are introducing a default change for Excel Windows desktop apps that run XLL add-ins: XLL add-ins from untrusted locations will now be blocked by default," Microsoft said in a new Microsoft 365 message center post. "We have already completed rolling out to Insiders preview. We will begin rolling out early March and expect to complete by late March."

Microsoft Excel now blocking untrusted XLL add-ins by default

Microsoft says the Excel spreadsheet software is now blocking untrusted XLL add-ins by default in Microsoft 365 tenants worldwide.

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