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


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Aug 17, 2014
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."

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