I have a question about the Exchange design that I'm proposing, the details are listed below. Should I use Front End, Bridge Head and NLB services on the same server? Note: all MX records for email point to Mail Gateway Appliance
Mail Gateway Appliance for inbound and outbound emails
Mail Gateway Appliance forwards inbound email to Exchange BE servers in acctive/avitive/active/passive cluster.
Two FE servers with NLB for OWA, POP3 and IMAP
Mail Gateway for inbound and outbound emails
Two FE/BH servers with NLB for OWA, POP3, IMAP
Mail Gateway Appliance forwards inbound email FE/BH servers
(Outbound Emails) Exchange connectors to Mail Gateway Appliance
Exchange BE servers in acctive/passvise active/passive cluster (Total 4 Exchange Servers).