Exchange 2010 SP3 Hybrid configuration

Current configuration :  multiple hub transport servers, multiple CAS servers, third party messaging gateway
Dirsync is already in place for other functions
wildcard certificate exists
i didn't yet completed or tried HCW
1. after HCW mail flow for on-premise users will stay the same ?
2. do we need to publish all hub transport servers to internet/port 25 ?
3. what IP adreses does hub transport communicates with, what ip addreseses i need in firewall rule , these https://technet.microsoft.com/en-us/library/dn163583%28v=exchg.150%29.aspx ?
4. i was thinking first leave MX record as is pointing to SMTP messaging appliance and after we are clear that everything is ok , point it to EOP ?
oompaloompaAsked:
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Vasil Michev (MVP)Commented:
1) up to you, both ways are supported
2) no, but if you want faster moves, use more than 1 server
3) you need to whitelist everything in the EO section here: https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2?ui=en-US&rs=en-US&ad=US
4) see 1, both ways are supported, just make sure you rerun the HCW when making changes
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AmitIT ArchitectCommented:
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oompaloompaAuthor Commented:
Few more things
- since there are two HT servers, and we have NLB appliance, we can publish to the NLB cluster IP?
- should we run HCW on both HT servers or running HCW on only one  server will configure whole environment for high availability ?
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