Unfortunately, we cannot allow apps to contain web searches. It looks like your previous apps were approved a while ago, before this rule was added to the guidelines. Unfortunately, you're going to have to remove the searches from those apps as well, or they will be suspended. Please have them removed by the end of this week (i.e. Oct 17th).
Also, as a rule, applications cannot contain any form of download or installation, other than Macromedia Flash, so unfortunately all Silverlight apps are ruled out.
I understand that this is inconvenient, and I'm sorry, but as the platform is evolving, our rules and guidelines must evolve as well.
Click on the links here if you'd like to take a look at our guidelines and terms of service.