http://www.ntcompatible.com/index.php Last 20 items on NT Compatible Esselbach Storyteller CMS System http://www.ntcompatible.com/O&O_defrag_8.5_64_bits_Server_Edition_c12749.html This product has been tested on the following operating systems: Windows Server 2003 64 Bit (x86_64),Windows XP and has a average rating of 5<br /><br />The last rating (5) has been submitted on 2007-09-19 11:13:39 by Anonymous running Windows Server 2003 64 Bit (x86_64):<br />Works fine and more faster than 32 bits. My computer configuration: AMD64 3200+ 1 GIGABYTE RAM (generic) 320 gigabytes MAXTOR HD 6600 NVIDIA (generic) nforce3 250 motherboard(GA-K8NSC939) Sound live 24 bits (value)