EXPERT RESPONSE
You're correct. Shrinking any database is a very costly operation, so most vendors avoid doing this at all costs. Exchange is no different. When you delete a large mailbox your database won't shrink in size at all. Essentially, you can think of the database size as remaining at the "high water mark" even after data has been deleted. This results in a certain amount of "white space" or empty space, existing inside of the database.
In order to "lower the high water mark" or reduce the size of the white space, you'll want to schedule a maintenance window for your Exchange server and run the ESEUTIL /D command on your database. This will shrink your database and reclaim white space.
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