They should follow Google. Let me type things like:

is:unread in:inbox from:jon "Mail's search could be improved"

You have to wonder why they don't. I'm sure they have the search infrastructure to do advanced search, which would dramatically improve the usefulness of Mail. For now, I must admit I am very happy with the vastly increased speed of search in Leopard (it's now quicker than logging into gmail and searching there, which is what I used to do).

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You can actually use a format very similar to that, you just have to use Spotlight instead. See my comment below.

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