Email provider is Microsoft 365 (via GoDaddy). It is set as a POP account on Thunderbird and all works correctly. When Thunderbird downloads new emails, they correctly show as "Unread." But on our phones (both iPhone and Android) the emails appear as "Read." This occurs even when the email are unread on Thunderbird. If Thunderbird is closed and a new email comes into phone, it correctly appears as "Unread" on our phones. But when I open Thunderbird and that same email gets downloaded (but not selected or read) the email becomes "Read" on our phones. I have gone into both Outlook and Thunderbird and have deselected any options that would automatically mark emails as read. This is annoying because, if Thunderbird is open on my computer, when I look at my phone, I get no notifications of unread email.