Azure AD Connect prep

Hi folks,

 

Have a quick question regarding a first time sync of Azure AD Connect.

We're preparing a move to Exchange online, and part of that will be the synchronization of our on-premise AD accounts to Azure AD & 365.

 

Currently a number of staff in the company already have office 365 accounts (using it for SPOL, SFB and Onedrive), and their current UPNs for logging into these office 365 accounts are actually the same as there NT logins for the on-premises AD directory (e.g. jdoe@company.com).

So when we try and do our initial sync with Azure AD Connect, I'm assuming we'll get numerous sync errors from Azure AD saying that a account already exists with the UPN or alias jdoe@company.com

My question is, when we do this initial Azure AD Connect sync, is there a way of us instructing Azure AD/365 to merge this new on-premise account with the previously created 365 account of the same name/UPN? Or maybe the initial sync will do this automatically anyway?

Any helpful info on this would be greatly appreciated!!

Thanks
Brendan