Updated. Now XP post-SP3 AIO UpdatePack can be integrated in a XP MCE 2005 SP3 source. First you must slipstream Service Pack 3 on a clean XP MCE SP2 source with the help of Universal UpdatePack/Addon Creator. Then integrate UpdatePack using Nlite or RVMi. As you know Onepiece's UpdatePack cannot include MCE-specific hotfixes, as RollUp KB900325 and KB973768, but you can run them from Svcpack at T-13: KB900325 needs a running .net 1.1 framework to install and it will find it.