Applies to: Exchange Server 2010 SP3

Topic Last Modified: 2012-04-24

Microsoft Exchange Server 2010 generates Extensibility events in Event Viewer so that you can troubleshoot and verify the Extensibility features and services. Event Viewer tracks the following kinds of events in the given order, based on importance:

Extensibility Errors and Events

The following table provides a list of Extensibility errors and events.

Event ID Category Event type Value or description

MSExchange Extensibility 1050



The execution time of agent '%1' exceeded %2 milliseconds while handling event '%3' for message with InternetMessageId: '%4'. This is an unusual amount of time for an agent to process a single event. However, Transport will continue processing this message.

MSExchange Extensibility 1051



Agent '%1' caused an unhandled exception '%2: %3' while handling event '%4'

MSExchange Extensibility 1053



Agent '%1' failed to create an agent instance with error '%2'.