In 2012, Hotmail Calendar was rebranded as Outlook Calendar. This icon was used on Windows 8 & Windows 8.1. This icon continued to be used on Outlook.com until the 2017 redesign.
Icon with the Outlook logo.
This icon is used on Windows 10 and 10X.
Microsoft Windows apps
3D Builder | Alarms | Battery Saver | Calculator | Calendar | Camera | Clock | Console | Data Sense | File Explorer | Fresh Paint | Games | Groove Music | Mail | Maps | Messages | Movies and TV | Music | Notepad | Paint (3D) | People | Phone | Photos | Podcasts | Settings | Sticky Notes | Storage Sense | Video | Wallet | WordPad