| Event Id | 16387 |
| Source | MSExchangeIM |
| Description | The requesting principal <user name> could not be matched with the authenticated user. (Error <error code>). |
| Event Information | The requesting user should supply corrected credentials and try the operation again. |
| Reference Links | XCCC: Event ID 16387 Is Logged When Trying to Log On Through Instant Messenger |
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