exchange 2003 with exchange 2010 in co existence

I want to get rid of exchange 2003 in my environment so that i can upgrade to exchange 2013

In exchange 2003 there is an option in system manager. under administrative group-->server-->servername-->protocols-->http
i right clicked and enabled form based authentication.

If i remove that tick exchange services do not work. This includes all exchange services owa, ews, autodiscover, ecp, oab,activesync. What can i do to get rid of exchange  2003

Looking forward for your assistance at earliest. Thanking in advance
Member_2_6474242Senior Systems AdministratorAsked:
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Hypercat (Deb)Commented:
This article will walk you through how to (1) make sure everything has been moved to the Exchange 2010 server; and (2) remove the Exchange 2003 server from the organization:

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Migrate all the mailboxes to Exchange 2010, decommission 2003.
Use Microsoft Exchange Server Deployment Assistant, use Exchange 2010 scenarios it would create a custom walk-through for you to migrate everything you need.
Sandeep KumarAssociate ConsultantCommented:
I am agree with Ronin. Migrate Exchange 2003 to 2010 and then Decommissioning Exchange Server 2003 will be better task.
You can do Exchange Migration and then follow the step by step guide give at for Decommissioning Exchange 2003.

If you need Exchange Migration help, then you can go for Kernel Migrator for Exchange software.
Member_2_6474242Senior Systems AdministratorAuthor Commented:
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