Event ID - 633

Event Id633
DescriptionSecurity Enabled Global Group Member Removed:

Member Name: <Member Name>
      Member ID: <Member ID>
      Target Account Name: <Target Account Name>
      Target Domain: <Target Domain>
      Target Account ID: <Target Account ID>
      Caller User Name: <Caller User Name>
      Caller Domain: <Caller Domain>
      Caller Logon ID: <Caller Logon ID>
      Privileges: <Privileges>     

Event InformationAccording to Microsoft

This event record indicates that a member has been removed from a global group. This event also occurs when a user account is deleted and removed from the built-in None group used internally by Windows 2000. There is no Failure Audit form of this audit event record. Removing members from groups can have security implications. This is especially true when a user is removed from the Administrator group.
The person with administrative rights for the computer should check to see who is being removed from groups that have security implications. Make sure that users removed from security sensitive groups really should be removed.
Reference Links"Event Id 633 of Source security

Alternate Event ID in Vista and Windows Server 2008 is 4729.

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