Just pasting the new Paging File size guidance on Exchange 2013 OS because we tend to forget the below new stance:

Moving forward with Exchange 2013, we recommend a fixed pagefile of the smaller of RAM size + 10MB or 32,778 MB (which is 32GB + 10MB).

http://blogs.technet.com/b/exchange/archive/2014/04/03/ask-the-perf-guy-sizing-guidance-updates-for-exchange-2013-sp1.aspx

Thanks Jeff Mealiffe !

Sam.