Outlook Web App has evolved over time. It started as Outlook Web Access (OWA) in 1997, gradually improving functionalities and interfaces with releases such as Exchange Server 2003 and Exchange Server 2007. It underwent significant updates in 2010 and 2013, introduced touch-friendly interfaces for mobile devices, and was eventually renamed as Outlook on the Web and later as Outlook for the Web in 2015 and 2020, respectively.