SQL Server 2005 Table Alias in Order By

Understand that SQL Server 2005 does not support table alias in order by clause
but I tried with SQL server 2005 at my development server, it works!
I wonder why
example as below
select a.UserID, a.ParentUserID, a.UserName, b.AccountName
from User a
inner join UserDetails b on a.UserID = b.UserID
order by b.AccountID -- AccountID is something not exists in select statement but in table b

and I check the database compatibility level, it is set to 2005 (90)
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Column alias is a problem, not table alias

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saimorAuthor Commented:
ah ha... only now i realise there is table & column alias. Thanks for pointing out.
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Microsoft SQL Server 2005

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