Read a little e-mail from Microsoft last week, 

<copied from an emial>

Windows Server 2003 end of support

Microsoft support for Windows Server 2003 and Windows Server 2003 R2 ends on July 14, 2015, which means the end of updates and patches, and a loss of compliance for any datacenter running this OS after this date. Explore your options and the resources available to assist in your upgrade and migration to Windows Server 2012 R2. Follow the simple four step process: Discover, assess, target and migrate to usher in the next stage of your datacenter evolution.

Will BW 2013 be supported on the recommended  Microsoft Server operating system 2012 r2 ?   Last I read it was not