In hotmail, my s10+ only shows inbox email that has been unread. At the top of the phone's email it reads "No Unread Messages". If I open emails on my desktop, then they won't show on my phone. This is a problem. Say I book a hotel reservation. As soon as I confirm the email on my desktop it drops from my phone, thereby preventing me from accessing the info on the road. Going back in to the desktop inbox and marking the email as unread does not solve this.