Adaptation kit upgrade  An Adaptation kit upgrade (AKU or Adaptation kit update) is a way of updating Microsoft's Windows Mobile. It is a collection of updates, fixes and enhancements to the tools delivered to hardware device manufacturers to create or update devices based on a specific platform. This term is used by Microsoft to designate the current update version for a particular embedded platform such as Windows Mobile which is used for Personal digital assistants and Smartphone devices. On the Windows Mobile platform the AKU is to Windows Mobile what a Service Pack is to Microsoft Windows. Microsoft releases AKUs to allow device manufacturers with updates to create new products or fix issues with older products. These enhancements are usually not available to the consumer or end user unless released as a firmware update from the vendor. Latest and the last update for Windows Mobile from Microsoft. Released in December 2010. AKU Build 23148  AKU Build 23145  AKU Build 21840  It is important to note that Windows Mobile is succeeded by Windows Phone in consumer electronics segment and Windows Embedded Handheld for industrial electronics. Windows Embedded Handheld starts with AKU 5.3.12. Windows Embedded Handheld is meant to carry on the Windows Mobile for rugged handhelds and is only a change in AKU over Windows Mobile 6.5. Unlike Windows Phone, WEH is compatible with WM 6.5. AKU Build 29049  AKU Build 29036  AKU Build 29023