Event ID - 4018

Event Id4018
DescriptionUnable to start the Internet Mail Connector service because MAPI could not be initialized.
Event InformationWhen you start the Internet Mail Connector (IMC), you may receive the following error message:
Error 2140: An internal Windows NT error occurred.
And event ID 4018 will be logged in the application event log.

CAUSE: If you receive this error, check the following:
Verify that Mapisvc.inf is located in the proper folder. It should be in the %System Root%\System32 folder.
Verify that the Exchange Service Account has at least change rights on the Mapisvc.inf file in the <systemroot>\System32 folder.
Verify that you have a private information store on that server.
Verify that the CommonName and HomeDSA registry entries are present and valid. They will be listed under:


RESOLUTION: If no Private IS exists on the Microsoft Exchange Server that the IMC is located on, add one by following these steps: Start the Microsoft Exchange Administrator program.

Open the File menu, click New Other, and click Information Store.
Select Private as the Information Store Type.
In the Server box, select the name of the Microsoft Exchange Server to which the store will be added.
Click OK.
Reference LinksCauses for Event ID 4018 when starting the IMC

XFOR: Event ID 4018 if IMC Started Without Private IS

XADM: Internet Mail Service Does Not Start After Demoting and Re-Promoting Windows 2000 Server Domain Controller

XFOR: The Internet Mail Service Does Not Start When Limiting Logons to the Information Store

XFOR: How to Clean MTS-IN/OUT Using Gwclient and Profinst Utilities

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