Migrating Exchange 2010 to 2013 with catch

Currently Migrating to Exchange 2013 from 2010. One question I need answered before proceeding is the Exchange 2010 box is on "mycompany.com" domain and we want to migrate it to Exchange 2013 on "mycompany.local"  anyone list any extra steps I need to do or any  issues I can run into?
James LAsked:
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David Johnson, CD, MVPOwnerCommented:
be aware that ssl certificates for .local will no longer be accepted by most public certificate providers.. After Nov 1, 2015 they will be untrusted http://www.digicert.com/internal-names.htm
Cris HannaSr IT Support EngineerCommented:
Any particular reason for creating a completely new AD domain and adding that complexity?
This blog gives you an outline of the process with involves creating cross forest trusts.

How many users in the current domain?
If there is not many users, consider migration using ExMerge.
Have you checked http://technet.microsoft.com/en-us/library/cc974332(WS.10).aspx - ADMT Guide: Migrating and Restructuring Active Directory Domains?
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Cris HannaSr IT Support EngineerCommented:
Exmerge isn't available after Exchange 2003
firstly, you're looking at changing your AD domain which makes this much more than an exchange migration.

You'll probably end up creating a brand new domain and setting up a trust between to the two to allow you to migrate user accounts and settings across. you can then deal with the exchange move.

Consider how much hassle and disruption you can handle before progressing with this.
Keeping the existing AD domain makes migration from 2010 to 2013 hugely easy.

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