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what problem do you are facing exactly?<br />
<br />
mail flow is getting stopped?<br />
OR<br />
Outlook is getting hanged or unable to start?<br />
U need to be specific about your problem, then only you can troubleshoot, otherwise you need to check each and every point?<br />
<br />
One problem I feel is, you have not updated exchange 2007 object SCP in active directory config container to exchange 2016 server and that might be creating issues
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Yes, I am sorry, the specifics are mail does stop flowing and once we re-enable the services mail resumes. &nbsp;So, you are suggesting that we update the Exchange 2007 object SCP in AD ...
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if mails are stopped flowing after you shutdown exch 2007, SCP is not an problem<br />
<br />
U need to look at your send and receive connectors?<br />
Have you migrated MX to 2016 server?<br />
also what about exchange URL associated with MX, is it pointed to exch 2016?
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SCP has been validated and no issues there. &nbsp;We identified configuration drift in the send and receive connector and all MX records are pointed to application upgraded servers. &nbsp;We are ready to test again and wonder if we need to check off anything else. &nbsp;I am not sure of your familiarity with Iron Port from the external firewalls, but this is the hurdle we are experiencing.<br />
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<div class="content wysiwyg-content">
Issue:<br />
<br />
Migrated to Exchange 2013 and desperately trying to decommission our legacy Exchange 2007 servers but after testing, by stopping the exchange services in 2007, it stops functionality of the new Ex 2013 environment and having a hard time determining the dependencies that is pointing back to the 2007 legacy. &nbsp;Any assistance would be greatly appreciated.
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Issue:

Migrated to Exchange 2013 and desperately trying to decommission our legacy Exchange 2007 servers but after testing, by stopping the exchange services in 2007, it stops functionality of the new Ex 2013 environment and having a hard time determining the dependencies that is pointing back to the 2007 legacy.  Any assistance would be greatly appreciated.

How can i determine what is pointing back to our legacy 2007 Exchange Infrastructure after 2013 Migration.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.