Event ID - 100

Event Id100
Descriptionthe Specified Service failed to start.
Event InformationAccording to Microsoft:

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.
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 Links"Internet Mail Service Does Not Start, Logs Event ID 2140 and Event ID 100 in the Application Event Log "

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