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Event ID: 16387 Source: MSExchangeIM

Source
Level
Description
The requesting principal http://server/instmsg/aliases/auser could not be matched with the authenticated user. (Error 1).
Comments
 
Microsoft suggests supplying corrected credentials by the requesting user and trying the operation again. See MSEX2KDB for details.
According to article ME280282, you receive this error message as a warning message because you are attempting to log on to Internet Messaging with valid but inappropriate credentials. For example, you are using the credentials of another user. Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server. It therefore sounds as though this message can be ignored.

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