Sending, receiving, and organizing email in Outlook.com
Hi, RD G
Since the read messages aren’t in Archive and there are no rules, the next step is to find out whether they’re missing from the mailbox itself or just from the app you’re using.
Here are some suggestions you can try:
Sign in to Outlook.com in a computer browser and search for one specific missing email by sender or subject. Also check the Other tab if you see one. If you find the message on the web but not in your mail app, the issue is with the app’s display or syncing.
If you use another mail program on a computer, check whether the missing messages are still there. A POP account can download mail to that computer and remove it from the server, leaving it unavailable elsewhere.
If a specific message is missing from Outlook.com too, contact Outlook.com support from Help > Help. Search for “missing emails,” then select Yes under Still need help? Tell them when the messages disappeared and that you’ve already checked the folders and recovery options.