From comment 0: > With I02 and earlier it was possible to do this with the File | Compact Folders menu item, even though it actually iterated though all the imap folders, compacting all of them and not just the currently selected folder. To be exact I should has said "it actually iterated though all the imap folders ```of the currently selected account```, compacting all of them and not just the currently selected folder".
Bug 1827973 Comment 2 Edit History
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From comment 0: > With I02 and earlier it was possible to do this with the File | Compact Folders menu item, even though it actually iterated though all the imap folders, compacting all of them and not just the currently selected folder. To be exact I should have said "it actually iterated though all the imap folders ```of the currently selected account```, compacting all of them and not just the currently selected folder".