Event ID - 100

Event Id100
SourceIMC
Description the Specified Service failed to start.
Event InformationAccording to Microsoft :
CAUSE
The Internet Mail Service or IMC property pages may not be properly configured. In the Internet Mail tab, the administrators mailbox may not be a valid mailbox.
RESOLUTION
To resolve the problem:
1. Start the Exchange Server Administrator program, click the Configuration container, and then click the Connectors container.
2. Double-click either Internet Mail Service or IMC, as applicable.
3. Click the Internet Mail tab of the Internet Mail Service or IMC properties page, and then select a valid user for the administrators mailbox. The Exchange Server Internet Mail Service or IMC starts.
Reference LinksInternet Mail Service Does Not Start

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