Event ID - 1016

Event Id1016
SourceMSExchangeIS
DescriptionWindows 2000 User <user name> logged on to <host name> mailbox, and is not the primary Windows 2000 account on this mailbox.
Event InformationNo user action is required.
Reference LinksWhat is causing Event ID 1016 to be logged in my Application Event Log in Microsoft® Windows NT® 4.0 and Windows® 2000?.

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