It is supported if you look at the certification matrix however you're crazy not to go with 64 bit unless you have something that prohibits you from doing that From cert matrix for Win 2003 64 bit and Oracle 10R2..... Certified on both 32-bit and 64-bit See MetaLink Note 742060.1 Release Schedule of Current Database Patch Sets iSQL*Plus version 10.2.0.3.0 and higher is certified on this operating system. -- //www.freelists.org/webpage/oracle-l