Are you getting an error or is it just saying that user is not in that OU? Does the user account physically live in the 'Users' OU or is it in a SubOU? What does InContainer() actually return?

Code:

Dim $UsersOU
$UsersOU = InContainer('OU=Users,OU=Information Technology,OU=Dublin,DC=lab,DC=iconcr,DC=com','User')
? $UsersOU[0]
If $UsersOU[0]=1
  ? 'T: (\\shortts\DATA)'
  Use T: '\\shortts\DATA'
Else
 ? 'User was not found in the Users, Information Technology OU or some other error'
EndIf