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Thanks. &nbsp;We are seeing some security events that I believe are related to these accounts.
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Thanks.  We are seeing some security events that I believe are related to these accounts.

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In the advanced security setting for our mailbox store we have several &quot;Account Unknowns&quot; with permissions settings. &nbsp;Is it safe to delete these?
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In the advanced security setting for our mailbox store we have several "Account Unknowns" with permissions settings.  Is it safe to delete these?

Exchange 2003 advanced security

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

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.