Microsoft Office is now 64-bit for Windows 11 on ARM bringing improved performance and better compatibility
Microsoft’s ARM-optimized Office apps showcase the company’s new ARM64EC technology for Windows 11 on ARM.
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What you need to know
Windows Insiders can already test out thefirst preview build of Windows 11. Now, they can get their hands on another preview piece of software from Microsoft, the 64-bit Office for Windows on ARM. The app has been recompiled for ARM architecture, which brings better performance and improved efficiency while using less memory. Microsoftannounced the ARM-optimized version of Officelast week, but it is now rolling out for testing.
Microsoft explains that the new version of Office should have overall better peformance, handle large documents better on devices like theSurface Pro X, and now work with 64-bit add-ins when compared to the fully-emulated version of Office.
The previous version of Office ran mostly native at 32-bit, with parts of the app presenting itself as x86 for add-ins to work correctly. Today’s shift brings Office up to a more modern 64-bit architecture while also being more native for ARM.
Microsoft enabled Word, PowerPoint, Outlook, OneNote, and Excel as ARM64 apps. Other Office apps will still run in x64 emulation mode.
The Office apps utilize a new technology from Microsoft calledARM64EC, which stands for ARM64 Emulation Compatible. This technology allows developers to mix and match code that’s built natively for ARM64 alongside code that runs in emulation. As a result, apps with dependencies that don’t natively support ARM64 can run partly as native apps and partly in emulation.
Office has x64 code and legacy add-ins that aren’t built for Windows 11 on ARM. With ARM64EC, Microsoft can rebuild large portions of the app to run natively on ARM devices, while the older components run in emulation.
To test out the new Office apps, you need to run a device with an ARM processor, such as the Surface Pro X orGalaxy Book S. You also need your PC to be on a Windows 11 Insider preview build.
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If you have the right hardware runningWindows 11, you can then follow these steps:
Microsoft has a guide onhow to join the Office Insider programif you need more help.
Sean Endicott is a tech journalist at Windows Central, specializing in Windows, Microsoft software, AI, and PCs. He’s covered major launches, from Windows 10 and 11 to the rise of AI tools like ChatGPT. Sean’s journey began with the Lumia 740, leading to strong ties with app developers. Outside writing, he coaches American football, utilizing Microsoft services to manage his team. He studied broadcast journalism at Nottingham Trent University and is active on X @SeanEndicott_ and Threads @sean_endicott_.
