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Each of the comments suggested a path of research that resulted in my solution. Thanks for the comments!
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Each of the comments suggested a path of research that resulted in my solution. Thanks for the comments!

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Email is attempted to a deleted user account whenever a resource is scheduled in Exchange 2007. Where/How do I remove this account?
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Email is attempted to a deleted user account whenever a resource is scheduled in Exchange 2007. Where/How do I remove this account?

Resource scheduling Exchange 2007

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.