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/MobileDeveloper.ListOfAKUs