An Adaptation kit upgrade (AKU or Adaptation kit update) updates Microsoft's Windows Mobile operating systems for devices (excluding Windows 10 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.

AKU Versions for Windows Mobile 5

AKU 1.0

AKU 1.1

AKU 2.0

AKU 2.1

AKU 2.2

AKU 2.3

AKU 2.5

AKU 3.0

AKU 3.2

AKU 3.5

AKU Versions for Windows Mobile 6

AKU 1.5.1

AKU 1.4.6

AKU 0.2

AKU 0.4.4

AKU Versions for Windows Mobile 6.5

AKU 5.3.11

Latest and the last update for Windows Mobile from Microsoft. Released in December 2010. AKU Build 23148

AKU 5.3.10

AKU Build 23145

AKU 5.0.60

AKU Build 21840

AKU Versions for Windows Embedded Handheld

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 5.3.12.7

AKU Build 29049

AKU 5.3.12.4

AKU Build 29036

AKU 5.3.12

AKU Build 29023