Outlook for the search and threads. The search is attrocious, the well known Ctrl-F means "forward" (why, but why?) and the search does not highlight the result

Outlook for the search and threads. The search is attrocious, the well known Ctrl-F means "forward" (why, but why?) and the search does not highlight the result in the mail, good luck finding it in a 1000 lines email thread. Email threads are not there; "Find related" works, but it does not help organize emails, while long emails with embedded history of other 20-30 messages and no capability to identify, expand/colapse messages are a nightmare. And the calendar is useful, but a black box. My calendar has about 0.5 GB and I have no idea what is taking up all that space and how to reduce it.