You forced on users a poorly conceived version of your mail client:
1. Every interaction is delayed by a second (selecting one or multiple items, deleting item(s))
2. For some devilish reason, I can no longer mark a domain as safe, therefore all my Amazon communications end up in Spam folder. Filters don't help.
3. You removed the "refresh" circular arrow next to "Compose button, and sometimes I open the computer after a longer time and there is no new mail, which with the amount of unsolicited mail, is impossible. I have to click around on folders in order for Inbox to refresh.

Please provide a way to revert to previous mail client.