It still freezes (as in says “not responding) for ten seconds when I type the first character in the search/filter box above the email list. How does something like that to pass through testing?

Something that scales with mailbox size, network latency or similar is happening on the UI thread in Microsoft Outlook. This boggles my mind every time it happens, which is every day.

Something tells me Outlook is a huge pile of legacy C++ that no one dares rewrite any major part of even in the face of issues like this.