Event ID - 120

Event Id120
SourceMSExchangeIS Public Store
DescriptionError occurred while attempting to enable the "Generate Security Audits" privilege.
To grant the Generate Security Audits privilege to the Microsoft Exchange service account, open the Windows 2000 Group Policy editor.
If the machine is not domain controller, select the Local Computer policy object.
Under either "Local Computer policy" or "Default Domain Controllers Policy", select the "Computer Configuration" container. Underthe "Computer Configuration" container, select the "Windows Settings" container. Under the "Windows Settings" container, selectthe "Security Settings" container. Under the "Security Settings" container, select the "Local Policies" container. Underthe "Local Policies" container, select the "User Rights Assignment" container.
Under "User Rights Assignment", double click the "Generate Security Audits" object and add the Microsoft Exchange service account to thelist of users granted the "Generate Security Audits" right. Click "OK", and close the editor.
Event InformationAccoridng to Microsoft :
Cause :
This error occurs during an attempt to start the Microsoft Exchange Information Store service and indicates that the Generate Security Audits privilege could not be enabled. This issue can occur if the Microsoft Exchange Information Store (Store.exe) is using an account other than the Local System account. The Local System is granted certain privileges during setup.
Resolution :
To resolve this issue, open Control Panel, and then configure the Local System account to be the account that starts the Microsoft Exchange Information Store service.
Reference LinksEvent ID 9530 from Source MSExchangeIS Public Store

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