Using '=' to check for NULL column value

We are currently encountering an issue where 10.1.0.5 is happily accepting a check on a column for a null value with what I have always known to be an invalid syntax.
For instance:
select col1 from my table where col1=null
Although this is wrong and we are working on locating the queries formatted as such, what I am wondering is why is it working on the 10.1.0.5 version but we cannot get the same query to execute on 8i, 9i, 10.2.0...? Is there a flag that can be enabled to allow this compare?

I am familiar with the correct syntax to be using. What I am looking for is a possible explanation as to why the query below returns the correct results on 10.1.0.5 and returns nothing in all other versions. I would expect the same behavior across all instances. See the two lines in bold "AREA=NULL" and "SUBAREA=NULL"
SELECT DISTINCT
UNIQID,
MGRCOMMENT,
REQ.CREATED_BY CREATED,
C2.CNAME DEVELOPER,
C5.CNAME PRODMGR,
C3.CNAME ASSIGNED,
C4.CONTACTID CURRENTUSER,
ID,
STATUSNAME,
REQ.STATUS STATUSID,
PRIORITYNAME,
TITLE,
MAS1.MODULENAME,
MAS1.AREANAME,
MAS1.SUBAREANAME,
MIN1.MODULE,
MIN2.AREA,
MIN3.SUBAREA
FROM REQ,
PRIORITY,
STATUS,
(SELECT FIRST_VALUE(M1.MODULENAME)
OVER (PARTITION BY REQUNIQID ORDER BY MODULENAME ROWS UNBOUNDED PRECEDING) MODULENAME, FIRST_VALUE(A1.AREANAME)
OVER (PARTITION BY REQUNIQID ORDER BY AREA ROWS UNBOUNDED PRECEDING) AREANAME, FIRST_VALUE(SA1.SUBAREANAME)
OVER (PARTITION BY REQUNIQID ORDER BY SUBAREANAME ROWS UNBOUNDED PRECEDING) SUBAREANAME, REQUNIQID
FROM REQMOD, MOD M1, ARA A1, SBARA SA1
WHERE M1.MODULEID = REQMOD.MODULE
AND A1.AREAID = REQMOD.AREA
AND SA1.SUBAREAID = REQMOD.SUBAREA) MAS1,
(SELECT FIRST_VALUE(C2.CNAME) OVER (PARTITION BY REQUNIQID ORDER BY CNAME ROWS UNBOUNDED PRECEDING) CNAME, REQUNIQID
FROM REQ_ASSIGN, CONTACT C2
WHERE C2.CONTACTID = REQ_ASSIGN.CONTACTID
AND ASSIGNMENT_TYPE=2) C2,
(SELECT FIRST_VALUE(C5.CNAME) OVER (PARTITION BY REQUNIQID ORDER BY CNAME ROWS UNBOUNDED PRECEDING) CNAME, REQUNIQID
FROM REQ_ASSIGN, CONTACT C5
WHERE C5.CONTACTID = REQ_ASSIGN.CONTACTID
AND ASSIGNMENT_TYPE=1) C5,
(SELECT FIRST_VALUE(C3.CNAME)
OVER (PARTITION BY REQUNIQID ORDER BY CNAME ROWS UNBOUNDED PRECEDING) CNAME, REQUNIQID
FROM REQ_ASSIGN, CONTACT C3
WHERE C3.CONTACTID = REQ_ASSIGN.CONTACTID
AND ASSIGNMENT_TYPE<>2
AND ASSIGNMENT_TYPE<>1) C3,
(SELECT DISTINCT REQUNIQID, CONTACTID FROM REQ_ASSIGN WHERE CONTACTID=5) C4,
(SELECT DISTINCT REQUNIQID, MODULE FROM REQMOD WHERE MODULE=1) MIN1,
*(SELECT DISTINCT REQUNIQID, AREA FROM REQMOD WHERE AREA=NULL) MIN2,*
*(SELECT DISTINCT REQUNIQID, SUBAREA FROM REQMOD WHERE SUBAREA=NULL) MIN3,*
REQCOMMENTS
WHERE PRIORITY.PRIORITYID = REQ.PRIORITY
AND STATUS.STATUSID = REQ.STATUS
AND MAS1.REQUNIQID = REQ.UNIQID
AND C2.REQUNIQID = REQ.UNIQID
AND C5.REQUNIQID = REQ.UNIQID
AND C3.REQUNIQID = REQ.UNIQID
AND C4.REQUNIQID = REQ.UNIQID
AND MIN1.REQUNIQID = REQ.UNIQID
AND MIN2.REQUNIQID = REQ.UNIQID
AND MIN3.REQUNIQID = REQ.UNIQID
AND REQCOMMENTS.REQUNIQID = REQ.UNIQID
AND REQ.PROJECTID = 3;

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