[ubuntu] Can Windows based programs be installed in Ubuntu

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http://ubuntuforums.org – Hi Folks, My name is Bruce. I'm a microsoft user and tired of it. Thinking of switching to Ubuntu for operating system. I run all windows based programs currently and was wondering if windows based programs can be installed on ubuntu. Cause all the programs i normally use as i remember didn't have a linux based options? So how limited would i be? Thanks, Bruce (Hardware)