I have the install media and license for Exchange 2010 but I have put off the task of upgrading from Ex2007. In the meantime, can I drop the 2010 OWA-related code into my Ex2007 environment to replace the existing OWA and take advantage of new OWA 2010 features? I see in 2007 IIS where the owa code is - in fact I seem to have several versions of scripts 8.2.xx and 8.3.xx. Is this doable and it is relatively low-risk? I could use an actual procedure if so. Existing server is 2008 R2.