How can I stop Outlook 2011 from moving messages out of the inbox?

Split from this thread.

This did not work for me.  

I need to make sure all of my emails stay on the server.  I have other devices that I use to read and write email and I cannot afford for my Mac to remove the messages from the server.  

Is there anyway to stop Outlook 2011 from moving messages out of the inbox and onto the local computer? If not, what other options do I have?

Thanks