Configuring preferences and options in Outlook on the web for business
"This is STILL a problem, and now it's even worse. Even though I have checked the "Mark items as read when viewed in the reading Pane," now ALL my messages are being marked as read as soon as I open the first one, and just for funsies, IT DOESN'T EVEN HAVE TO BE THE FIRST EMAIL AT THE TOP OF THE LIST (most recent). If I open an unread email that's five emails down in a list of 12 unread emails... they ALL become marked as read."
I have noticed this behaviour when you have Outlook set to "Conversation view" which I find the stupidest, most unintuitive, hardest to use and easiest to lose mails way of organising anything. Set it to display messages as they come in and this goes away, and so do a load of other issues. With one click you can always sort by subject to get all the mails in the thread grouped together again 🤷♂️
