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Once you have deleted your emails (remember: they are safe elsewhere; this is just the old copy), then you need to empty your deleted items.
Right click on the Deleted Items and select Empty Deleted Items.
Once you have done this -- to make sure that nobody in your organisation can continue to read your deleted emails, they need to be fully deleted.
Right click on Deleted Items and select Recover Deleted Items.
To read more on this gallery, visit the iGeneration column, where you can read more about migrating your email to Hotmail or Gmail.