So many issues with this format, I will have to list them
1) Composing, replying, forwarding all create a window which obscures everything else. No way to be able access any of the mail folders to crosscheck things without having to save your started file to Draft, close it and then having it to reopen it after referring to the desired folder. Once you have saved a composed letter to Draft, no way to actually send it after reopening it, so you may need to restart your letter. At that point, you can Send a reply or forward only. This is probably the most frustrating thing. There used to be more options in the menu bar so you could access Drafts without having to close everything else and you still had access to all your folders.
2) attached (JPG) files you used to be able to click to see a thumbprint and make sure it is the correct image. Not possible any more.
3) all my email addresses that were stored within mail are lost. When entering the required name that would easily pop up before, the message comes on "Empty contact list". Only the old addresses saved on the external Contacts appear. This is a major problem one can imagine!
4) There seems to be a lot more clicking needed for most functions and then often ending up somewhere not wanted.
5) Probably more issues coming up as I try to navigate this and wishing the old interface back with all my heart despite its shortcomings.
6) This version works only for the most basic tasks, anything more complex is utterly frustrating. After having used Bell for my mail since email was invented, I am seriously considering switching, though having to change my sympatico address has been stopping me so far. It seems the lesser problem right now.