No, you only need to generate one certificate. Your OWAs will both be
accessed by one name - e.g. mail.yourcompany.com. You want to generate the
cert for mail.yourcompany.com, not the server name like OWA1 and OWA2 or
something.

Signature
--
Brian Desmond
Windows Server MVP
desmondb@payton.cps.k12.il.us
Http://www.briandesmond.com
> If I am going to setup NLB for two OWA nodes, should I generate certificates
> for both nodes ? Anything special about using digital certificates when OWA
> boxes are on NLB ?