Windows for iPhone

Windows for iPhone was first developed in May of 2004 and released in June of 2005. This has gone through many stages over the years, and still runs on today.

2005-2010

 * Windows for iPhone 1.00 (Longhorn aero design)
 * Windows for iPhone 1.01 (Longhorn plex design)
 * Windows for iPhone 2.0 (Vista Basic Theme)
 * Windows for iPhone 2.01 (Vista Classic Theme)
 * Windows for iPhone 2.02 (Vista Regular Theme)
 * Windows for iPhone 3.0 (Windows 7 Basic Theme)
 * Windows for iPhone 3.1 (Windows 7 Classic Theme)
 * Windows for iPhone 3.50 (Windows 7 Regular/Aero Theme)

2011-2020

 * Windows for iPhone 4.0 (Windows 8 Last Aero Theme - coloured blue)
 * Windows for iPhone 4.1. (Windows 8 Metro UI)
 * Windows for iPhone 4.5 (Windows 8.1 Metro UI)
 * Windows for iPhone 5.0 (Windows 10 Metro UI)
 * Windows for iPhone 5.1 (Windows 10 May 2019 Update - Metro UI)
 * Windows for iPhone 6.0 (Windows 2020 Redesigned Aero UI)
 * Windows for iPhone 6.1 (Windows 2020 Metro UI)

Development
The Windows for iPhone operating system began in May 24th, 2004. Bill Gates, who thought of the idea, said that there would be different types of user interfaces throughout the years of the operating system. Apple had co-operated with Microsoft to create the idea.