Outlook is probably the worst software I encountered. I have seen relative being reduced to tears because she was not able to find her important emails and genuinely thought they were gone only to find out Outlook search is so crap it wouldn't find them despite getting literal sentences that were in those emails. I also particularly like merging unrelated email threads into one so you end up not following what the threads are about. The focused view is the best. It hides the emails you actually care about from you. Software like this should be illegal to distribute.