Windows Mobile 6 is powered by Windows CE 5.0 (version 5.2) and is strongly linked to the then newly introduced Windows Live and Exchange 2007 products. Windows Mobile 6 Standard was first offered on the Orange's SPV E650, while Windows Mobile 6 Professional was first offered on the O2's Xda Terra.

Feb 02, 2009 Breathe New Life Into Your Aging Windows Mobile 6.x Device Aug 21, 2016 Windows Phone - A short history

SetImageFlags returned E_INVALIDARG in Windows mobile 6.0

Windows Mobile 6.0 Crossbow Pirated Available for Download Mar 02, 2007 Microsoft touts support for Windows Mobile 6.0 | Computerworld

Windows Mobile 6.0 Green desktop theme as a default. Windows Mobile 6.1 More optimized than 6.0. Windows Mobile 6.5 Change: New dark blue desktop theme as a default. Windows Embedded Handheld 6.5.3 Change: Like Windows Mobile 6.5 but with the Start-Button on the bottom; Windows …

Download Windows Mobile 6 Professional and Standard Software Development Kits Refresh - Adds documentation, sample code, header and library files, emulator images and tools to Visual Studio that Windows Mobile 6.0 - Find link - Edward Betts