OK, besides have you tried two of the following query. The first query is a single MSGID column.
(1)
LogParser "SELECT DISTINCT MSGID FROM test.log WHERE Event-ID = '1028'
OR Event-ID = '1020'" -i:W3c -separator:tab -dtlines:20 -o:datagrid
(2)
LogParser "SELECT DISTINCT MSGID,Event-ID, Time, Recipient-Address,
Sender-Address, Message-Subject FROM test.log WHERE Event-ID = '1028'
OR Event-ID = '1020'" -i:W3c -separator:tab -dtlines:20 -o:datagrid