If you are like me using MDT 2012 Update 1, and recently decided to update old images with fresh install and latest Microsoft patches, there is a strong chance that you might run into following error during image deployment.
Error is encountered during the processing of unattend.xml, more precisely on IE customization. It appears that IE10 does not support <IEWelcomeMsg> tag and that causes the whole deployment to hang. IEWelcomeMsg tag is present by default in unattend.xml file created by MDT 2012, so the solution is to either upgrade to MDT 2013 which has this issue resolved or to manually remove/comment this line.
You’ll find the unattend.xml file for each sequence under MDTDeploymentShare\Control\%Task Sequence ID%\
Just remove or comment the line like this:
<!-- <IEWelcomeMsg>false</IEWelcomeMsg> -->