AKUなに？：Mobile-review.com

In Windows Mobile’s case such updates go by the name of Adaptation Kit or Adaptation Kit Update (or simply AKU abbreviation, which we will use throughout this review) ? they usually patch up existing bugs and enable several new features. Each newly released AKU pack retains fixes found in previous versions of AKU, so in order to emphasize the most crucial fixes carried by AKU, the company sometimes turns to Feature Pack (FP) term, adopted from S60 platform. Significance-wise, Nokia S60’s FP and Windows Mobile’s AKU are on a par with each other, thus FP term applied to Windows Mobile has more of a marketing move rather than actual necessity in it.

Mobile-review.comにWM5のアップデートであるAKU(Adaptation Kit Update)の0.1から最新版の3.0まで詳しいレビューがあがっています！
AKUのほかにMSFP(Messaging and Security Feature Pack)についてもかかれているので英語の読み物系ですが、WM5の微妙だけどかなり変わっているAKUの概要にざっと目を通してみるのもいいかも知れません(^^ゞ
どっかに日本語解説あるといいんだけど・・・・(;O;)
http://www.mobile-review.com/pda/articles/wm-aku-en.shtml