Old outer join syntax produces different results from new syntax!

Question

I have inherited a query that uses the old outer join syntax but that is yielding correct results. When I translate it to the new outer join syntax, I get the results I expect, but they are not correct! And I don't understand why the old syntax produces the results it produces. Bottom line: I want the results I'm getting from the old syntax, but I need it in the new syntax (I'm putting it into Reporting Services, and RS automatically converts old syntax to new).
Here's the query with the old outer join syntax that is working correctly:
Code Snippet
SELECT   TE = COUNT(DISTINCT T1.ID),
         UE = COUNT(DISTINCT T2.ID),
         PE = CONVERT(MONEY, COUNT(DISTINCT T2.ID)) / 
              CONVERT(MONEY,COUNT(DISTINCT T1.ID))
FROM     TABLE T1, TABLE T2
WHERE    T1 *= T2
In this query, much to my surprise, TE <> UE and PE <> 1. However, TE, UE, and PE seem to be accurate!
Here's the query with the new outer join syntax that is working but not producing the results I need:
Code Snippet
SELECT   TE = COUNT(DISTINCT T1.ID),
         UE = COUNT(DISTINCT T2.ID),
         PE = CONVERT(MONEY, COUNT(DISTINCT T2.ID)) / 
              CONVERT(MONEY,COUNT(DISTINCT T1.ID))
FROM     TABLE T1 LEFT OUTER JOIN TABLE T2 ON T1.ID = T2.ID
Though not producing the results I need, it is producing what would be expected: TE = UE and PE = 1.
My questions:
1) Can someone who is familiar enough with the old syntax please help me understand why TE <> UE and PE <> 1 in the first query?
2) Can someone please tell me how to properly translate the first query to the new syntax so that it continues to produce the results in the first query?
Thank you very much.

Answer 1

How can we reproduce the issue?
Code Snippet
USE [master]
GO
EXEC sp_dbcmptlevel Northwind, 80
GO
USE [Northwind]
GO
SELECT
TE
= COUNT(DISTINCT T1.OrderID),
UE = COUNT(DISTINCT T2.OrderID),
PE = CONVERT(MONEY, COUNT(DISTINCT T2.OrderID)) /
CONVERT(MONEY,COUNT(DISTINCT T1.OrderID))
FROM
dbo
.Orders T1, dbo.Orders T2
WHERE
T1
.OrderID *= T2.OrderID
SELECT
TE
= COUNT(DISTINCT T1.OrderID),
UE = COUNT(DISTINCT T2.OrderID),
PE = CONVERT(MONEY, COUNT(DISTINCT T2.OrderID)) /
CONVERT(MONEY,COUNT(DISTINCT T1.OrderID))
FROM
dbo
.Orders T1
LEFT OUTER JOIN
dbo.Orders T2
ON T1.OrderID = T2.OrderID
GO
EXEC sp_dbcmptlevel Northwind, 90
GO
Result:
TE
UE
PE
830
830
1.00
TE
UE
PE
830
830
1.00
As you can see, I am getting same results.
AMB