I am wanting to deploy Skype 7 to all our users via DC, we previously installed 6.18 via GPO, so I created a custom script to remove 6.18 as a pre-deployment task.

MsiExec.exe /X{1845470B-EB14-4ABC-835B-E36C693DC07D} /passive /norestart

However if for some reason Skype was not installed by GPO the pre-deployment script fails and version 7 is not pushed out, how can I configure the exit code to proceed if the 6.18 version was not found?