Sending, receiving, and organizing email in Outlook.com
Hi, Mum Robinson
I’m sorry this happened. First, determine whether the messages are missing from the mailbox itself or only from the Outlook app, as this changes the available recovery options.
Here are some suggestions you can try:
Sign in directly at Outlook.com in a browser. Search for a known sender or subject, then change the search location to All folders. If the emails appear online, remove and re-add the account in the Outlook app to rebuild its synchronization.
Check Settings > Mail > Forwarding and IMAP. If POP is enabled, an older computer, phone, or mail program may have downloaded and removed messages from the server. Check those devices for local copies before changing anything.
If classic Outlook was previously used, select File > Open & Export > Open Outlook Data File and look for an existing archive or backup .pst file. Older messages may still be stored there.
If the emails are also absent from the web mailbox, use Help > Help > Still need help? to contact Outlook.com support. The forum cannot inspect or restore server-side mailbox data.