Hi: I personally would use 5.1, 5.3 is vista only as I understand. Sean. _____ From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Dónal Fitzpatrick Sent: 14 August 2008 16:16 To: programmingblind@xxxxxxxxxxxxx Subject: Microsoft Speech SDK Hi all, I have a quick question regarding the different versions of the speech SDK. I need to write a self-voicing application that works on both Vista and XP. Which version of the sdk should I install, 5.1 or 5.3? thanks for any guidance, Dónal __________ Information from ESET NOD32 Antivirus, version of virus signature database 3356 (20080814) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com