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Unless they are planning to stay with IE6 until the end of the universe, aren't they just postponing the eventual expenditure. At some point they will have to make the migration. Meanwhile, any costs from using a 9 year old browser (malware, productivity reduction etc) are pilling up.
What does make sense is to delay the migration until IE9 is out. If they where going to migrate anyway, why not wait for IE9 since it's just a few onths away?