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We are currently using name1.local for our internal domain, our email is name2.com. We are moving to Azure and need to change it, so we are thinking to move it to name2.com to coincide with our current email addresses. In our current DNS we have name1.local and name2.com resolving to external IP's. <br />
If we create a cross-function domain using name2.com is that going to cause us all sorts of grief with DNS?
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We are currently using name1.local for our internal domain, our email is name2.com. We are moving to Azure and need to change it, so we are thinking to move it to name2.com to coincide with our current email addresses. In our current DNS we have name1.local and name2.com resolving to external IP's. 
If we create a cross-function domain using name2.com is that going to cause us all sorts of grief with DNS?

Azure Directory Sync

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.