Here is a list of known Adaptation Kit Update (AKU) releases and their associated build number. Click to read this topic

5/18/2006 12:11:43 PM -
WhatIsAnAKU?

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Release                   Build 
AKU 2.5                   14967 
AKU 2.3                   14955 
AKU 1.3                   14523 
AKU 2.2.1                14929 
AKU 2.2                   14928 
AKU 1.1.4                14411 
AKU 2.1                   14914 
AKU 1.1.3                14410 
AKU 1.1.2                14409 
AKU 2                      14847 
AKU 1.1.1                14406 
AKU 0.1.2                14355 
AKU 0.2                   14359 
AKU 1.0.2                14367 
AKU 1.1                   14402 
AKU 0.2                   14359 
AKU 1.0.1                14366 
AKU 0.1.1                14354 
AKU 0.1                   14352 
AKU 1.0                   14363 
Windows Mobile 5.0  14343 

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The MSFP (Messaging and Security Feature Pack) was included with AKU 2 and later.

See this section on MSDN for details on MSFP.

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You can obtain the build number and AKU of a particular device in several ways:

From the device itself

When using the device, type Start / Settings / System Tab / About

The information displayed includes a Build number, for example Build 14967.1.1.

The larger number is the build number, and from that, you can determine the AKU release.

Programmatically

Using a C# application, the OSVersion.Version method returns build information.

Programmatically, Using the Registry

The AKU version is stored in the registry: HKLM\\SYSTEM\\Versions\Aku

Source: http://channel9.msdn.com/wiki/default.aspx/MobileD...OfAKUs