1. Is device certificate has anything to do with the SSL certificate for Exchange?no
2. How do you generate CSR for device certificate? How is the Key request generated? I guess I have to send both of them to CA.only CSR is sent to CA.
there is information regarding device certificate in the sol below.
sol8187: Troubleshooting BIG-IP device certificates (9.x - 10.x)
http://support.f5.com/kb/en-us/solutions/public/8000/100/sol8187.html
3. I have to generate SSL SAN certificate CSR for Exchange? How do I generate Key along with this?i understand key is created on step 7 in the sol (sol11438) you mentioned.
sol11438: Creating SSL SAN certificates and CSRs (9.x - 11.0.0)
http://support.f5.com/kb/en-us/solutions/public/11000/400/sol11438/
4. Do I need to have both Device Certificate and SSL certificate for it to work properly?i understand only ssl certificate.
5. Is the Key for Device Certificate same as the Key for SSL certificate?i think so. all are public key infrastructure.
hope this helps.