Domain Service Account Overview
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We have the option of designating a separate service account for each application.
We could also have designated one account for on-premises applications
(Skype for Business Server and Exchange Server) and a different one for online
services (Office 365, Skype for Business Online, and Exchange Online).

You can mix and match service accounts in any way that makes sense for your
organization.

For this example, we will use a single domain service account for managing all of
the on-premises and online applications.