The tech giant is looking to replace Calibri - which took over from Times New Roman in 2007 - and its commissioned five custom fonts which will eventually step in as the default choice.
In a press release this week, the design team said: "A default font is often the first impression we make; it's the visual identity we present to other people via our resumes, documents, or emails.
"And just as people and the world around us age and grow, so too should our modes of expression.
"Calibri has been the default font for all things Microsoft since 2007, when it stepped in to replace Times New Roman across Microsoft Office. It has served us all well, but we believe it’s time to evolve.
"To help us set a new direction, we’ve commissioned five original, custom fonts to eventually replace Calibri as the default."
The company has called on users to give their thoughts on social media, with Tenorite (Erin McLaughin and Wei Huang), Bierstadt (Steve Matteson), Skeena (John Hudson and Paul Hanslow), Seaford (Tobias Frere-Jones, Nina Stossinger and Fred Shallcrass) and Grandview (Aaron Bell) revealed as the contenders.