Calibri was originally design by a guy from the Netherlands called Lucas de Groot, exclusively for Microsoft ClearType rendering technology. This unique font features subtly rounded stem and corners that can be visible at larger sizes.
Calibri Font was first introduced in Windows Vista and Microsoft Office 2007. This font has been so popular that it replaced the default “Time New Roman” default font on Microsoft Word and other office applications. It continued to be the default typeface in Microsoft Office 2010 applications.