I am unable to find the server requirements for the external server in a dual server setup for EMM. I would just like to verify if it requires 32 or 64 bit.
Take a look at page 20-21 https://kc.mcafee.com/corporate/index?page=content&id=PD22787 I think this might be what you are looking for. (Requirements section starts on Page 15-16)
EMM DMZ Server
Windows Server 2003 x86 or 64 bit
Windows Server 2008 64bit (Standard or Enterprise versions)
Windows Server 2008 R2