The updated Office uses Fluent design across Word, Excel, PowerPoint, OneNote, Outlook, Access, Project, Publisher, and Visio. The updated apps are meant to look similar to the Windows 11 OS, design-wise. Via the updated Office interface, Office is set to match users' Windows themes, including black (Dark Mode), white, colorful, or dark gray. The Quick Access toolbar is hidden by default in the name of simplifying the interface.
The refreshed Office is available to Office Insider testers running Beta Channel builds. Those who don't want it can turn off the "Coming Soon" feature at the top right hand corner of the menu. Testers can toggle between the new and existing interface to move between the current and newly updated Office apps.
"Office on ARM64 is built as an ARM64EC (Emulation Compatible) application, which allows for the ARM64 code of Office to interoperate with x64 code of legacy add-ins," officials said in their blog post, pointing to this article about ARM64EC.
In order to test this new Office for Arm test build, users need a Windows on Arm PC which is enrolled in the Windows Insider Dev Channel so that they can download today's first official test build of Windows 11. They'll also need to be part of the Office Insider program to get access to the Beta channel Office on Arm test build and will need to uninstall any 32-bit versions of Office they might have currently installed.
There are a number of known issues in this Office on ARM64 release. Teams integration with Outlook isn't yet complete and some search features are not yet working properly, Microsoft's blog post says.