I have my customer applying for the a CA for the Expressway Edge for Jabber Guest and MRA (two different virtual machines on the same BE 7000)  they are requesting CA from DigiCerts.  I have never been asked what type of server the Expressway is.  Some of the options that are available are:
Apache, Cisco, Tomcat. 
Does anyone know the answer to this what type of server the Expressway Edge is.  I have talked to some people and they are leaning towards Apache.  I need to confirm this before telling the customer.  Please let me know.
Thanks,
M