Calibri has been the default font for Microsoft Office tools since 2007, but now the firm is harking after change. In case you wondered what the default was before it, that honour was taken by Times New Roman. Thus, a sans-serif face replaced a serif one, and it did do on many of the communications people created, printed, and sent to one another. Many people just stick to defaults.
Rather than hunt through the squillions of already in existence fonts that are out there for a worthy successor, Microsoft's Office design managers have decided to commission five new fonts to provide a shortlist choice with the necessary flexibility, readability, and wide range of glyphs that a default font requires.
The five new fonts are called Tenorite, Bierstadt, Skeena, Seaford, and Grandview. Microsoft says those who are very interested in this choice shouldn't worry as whichever Microsoft / the community chooses as default, all of these five designs will become available to Office users via the font menu. They are already live in the cloud based Microsoft 365 apps and experiences.
The five new fonts span four sans-serif styles and Microsoft has provided short interviews with the designers in its blog, if you want to read more. I've embedded the neat Scrabble tile presentations of the fonts above and below. The top screenshot comes from Microsoft's Twitter feed where you can comment and the 'quick brown fox' text might be useful for your consideration, as below.