Fix Your Desktop

As part of migrating from an older iMac to my new Macbook Pro (which I love) I went through and axed a ton of unwanted email from Microsoft Entourage. I know that I can copy my mail archive, address book, etc, by moving the contents of Documents:Microsoft User Data:Office 2008 Identities, but my question is whether there's any way to compact, compress or rebuild my archive before I do so?

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