Office 365 Deployment with new local domain

I just started working for a company that has somewhat implemented Office 365 to about 100 users. They are mostly using it for Exchange Online. No ADFS or AD Sync has been done between the on-premise domain and Office365.
The same user accounts do exist in the local domain.
Once we get ADFS and AD Sync working what will happen between the Office365 accounts and the local accounts. For instance, in Office365 we have
[email protected] and locally we have a user
[email protected] Will the accounts just sync together and use the information from the local domain since the IDs are the same.

Hi,
This is the forum to discuss questions and feedback for Microsoft Office client. There is so much about Office 365
Directory integration aspect here, I would suggest you to post in the forum of Office Community, where you can get more experienced responses:
http://community.office365.com/en-us/f/613.aspx
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Regards,
Ethan Hua
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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