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When using service accounts, you should have a specific AD account for each major service.
Figure: Bad example - Using the default Administrator account
Figure: Better example - At least don't use the Administrator account, create a new account
Figure: Best example - A specific AD account for each major server
Figure: Bad example - Using the network admin's name
Figure: Good example - A specific SQL Server account being used (Suggestion: Make the text box wider and link to the one in 'Services')