• Open IIS (Internet Information Services) Manager Console
• Select Default Web Site and double click on HTTP Redirect 
  • Check “Redirect requests to this destination” box and enter your OWA https address where you want to redirect to.
    i.e. https://webmail.company.com/owa
  • Select “Only redirect requests to content in this directory (not subdirectories)“
  • In “Status Code” select “Found (302)“
• Open HTTP Redirect in each of following virtual directories and clear “Redirect requests to this destination” box
  • Autodiscover
  • Ecp
  • EWS
  • Microsoft-Server-ActiveSync
  • OAB
  • Owa
  • PowerShell
  • PowerShell-Proxy
  • Rpc

• In Default Web Site double click on SSL Settings 
• Clear the box next to Require SSL 
• Open SSL Settings in each of following virtual directories and select “Redirect requests to this destination” box
  • Ecp
  • EWS
  • Exchange
  • Exchweb
  • Microsoft-Server-ActiveSync
  • OAB
  • Owa
  • Public
  • Rpc

Windows Server 2008R2
Microsoft Exchange 2010
IIS 7