Greetings. We've been using Directory Sync. with our on-premises Exchange 2010 (SP3) server and Exchange Online Protection.
I understand with a cutover migration that DirSync is not used.
In our "Office 365" portal, there are "user" accounts already created for all mail-enabled users.
In the "Exchange" section of the portal, Recipients, there are no mailboxes created yet.
When we create the first cutover migration batch, will there be a problem creating Exchange user accounts in the cloud because those "user" accounts already exist under "Office 365" ? We're using a temporary non-Microsoft SPAM filtering solution, so in theory I can delete all those "users" already created.