MS Exchange 2000 error (Event ID: 9548)

I am receiving a lot of these error messages in my Application Event Viewer

Disabled user /O=MyCOMPANY/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=G.DONKIN does not have a master account SID. Please use Active Directory MMC to set an active account as this user's master account.

What does this mean and what can be done to resolve these errors?

I am new to Windows 2000 / Exchange 2000 so please help.

Nick.
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