One thing that really irks me about Google's implementation of IMAP is that when you "delete" a message in Outlook, it doesn't move the message to Google's "Trash", but instead just removes all the labels. Since Gmail doesn't have a good way to view just unlabelled messages, it makes it a pain to clean things up. The only thing I've found that really works is to build a huge search filter excluding all my labels—which is horrible.
Google would make my life easier by implementing too small changes:
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