Finding out where the Administrator Account is used on the network

Is there a tool or any way to find out where the AD administrator Built-in account is being used on the network to authenticate?

It's been used heavily up until recently for several apps as a way of gaining say WMI access or sending mail via the SMTP server.
I'm keen to change the password but don't want to break everything.

Or Role holding server is a Windows 2008R2.
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Muhammad BurhanManager I.T.Commented:
1. Configure Event Forwarding.

2. Configure Advance Auditing on Clients Computers
3. Filter Event logs in DC's Event viewer, Event ID:4672 is for Special Logon

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wannabecraigAuthor Commented:
That link is for 2012, we're using 2008 R2, is it the same?
wannabecraigAuthor Commented:
If I have other polices below the default will this cause them to stop working?
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Windows Server 2008

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