Exchange 2003 > 2010 Certs & Namespace

Please can someone give me some guidance on this, I am planning a migration from exch 2003 > 2010 however I am struggling to get my head round how the Certs will work

We are not using split DNS but I plan to add a zone before the migration

Current environment

1 x exchange 2003 from web users connect to - SSL certificate from trusted CA

Future environment

2x exchange 2010 site 1
1x exchange 2010 site 2

I plan to run both in co-existence mode for a while so I will need to keep webmail. (Unless I reconfigure active sync devices)

What do I need to request certificate wise?

I planned to use and (for failover) for all external services but how would Activesync/OWA be routed to the 2003 server during the transition?
StuartTechnical Architect - CloudAsked:
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AmitIT ArchitectCommented:
Use Exchange deployment Assistant tool.

Just in summary, you need to point all your OWA/AS etc. services to 2010 server and 2010 will be proxy back to 2003 user.

More details are here:

If you ask my suggestion, if you can wait for few more months directly go to exchange 2016. Though 2003 to 2016 migration is not possible, you need to migration to 2010 and then to 2016.

Exchange 2016 is way better then 2010, with just two role. Mailbox and Edge. You heard right, only mailbox role, CAS also gone.

Rest you can review and decide.

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StuartTechnical Architect - CloudAuthor Commented:
Apologies for the late response, thank you :)
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