Deploy office 365 applications

Hi All, 

We recently migrated to office 365 but did not update the users applications.  We are going to do this soon so I was wondering what the best method would be to deploy it to around 75 users.  I know I can set it up to install via GPO but is there a way to remove the current versions of office or remove it while installing the new version?  I don't believe that GPO will remove any current versions. 

Thanks and appreciate the assistance.