Exchange 2010 ActiveSync Configuration for Cell Phones

Existing environment is SBS 2003 with Exchange 2003. I added Server 2008 R2 as Domain Controller to existing SBS 2003 forest. I added Server 2012 R2 as Domain Controller to existing SBS 2003 forest. I DCPROMOed Server 2008 R2 and removed it as a Domain Controller and powered it off forever. I migrated DHCP database from SBS 2003 to Server 2012 R2. I installed Exchange 2010 on another Server 2008 R2 member server. I migrated 3 mailboxes from Exchange 2003 to 2010. I can send and receive emails, to and from other Exchange 2003 users and the 3 Exchange 2010 mailboxes using Outlook 2010. Cell phone syncing still works for Exchange 2003 mailboxes. Everything seems to work fine except, cell phone syncing for the 3 mailboxes in Exchange 2010 does not work. I'm using an iPhone 3GS to connect to Exchange 2003 ActiveSync through my WiFi internet connection to the Exchange 2003 mailboxes and it works perfectly. But using the same iPhone 3GS to connect to Exchange 2010 ActiveSync through my WiFi internet connection to the Exchange 2010 mailboxes does not work. Does Exchange 2010 ActiveSync support connecting through a WiFi internet connection or does the mailbox require an Exchange 2010 Enterprise CAL installed first, before the Exchange 2010 ActiveSync supports connecting through a WiFi connection to work properly? Is there a document that details the configuration of Exchange 2010 ActiveSync for cell phone connections, from start to finish.
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IvanSystem EngineerCommented:

when you deploy Exchange 2010 in Exchange 2003 enviroment, you should reconfigure mail flow, so that it goes  to Exchange 2010. If it is pointing to Exchange 2003 , then it wont work, since 2003 dont know how to proxy requst to new Exchange.

So, internet --> router --> exchange 2010

You have connectors between those 2 servers, so they will know how to route email.
If you try to connect to exchange 2003 from internet, exchange 2010 will redirect or proxy that request to exchange 2003..and that should be it.
Of course, you should point dns records to new exchange as well.

When you redirect mail flow, you should point legacy DNS record to exchange 2003, since that record is used to redirect traffic to it.


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