Build 
Definition  Application build version. 

CreatedBy 
Definition  User ID of the person who is inserting the data. 

CreatedWhenUTC 
Definition  Data and time when the data was inserted / added. 

MSReplrowguid 
Definition  MSReplrowguid 

ExchangeDocumentEventMessageId 
Definition  Primary Key for table 

ExchangeDocumentEventId 
Definition  Parent’s Primary Key 

Description 
Definition  Text message containing details of history entry.