Hi Jean Cufley,
Welcome to Microsoft Q&A.
If Sent Items suddenly disappeared in Outlook.com (web), it's usually not gone, it's either unpinned from Favorites, the folder list is collapsed, the folder was moved, or it was deleted and can be restored.
Please try these in Outlook.com (web):
1) Check Favorites vs. the full Folders list
Sometimes Sent Items is only removed from the Favorites section at the top.
- Expand the left pane (click ☰ top-left if needed)
- Look under your full Folders list (below Favorites) for Sent Items
- If you find it: right-click Sent Items > Add to Favorites (or Pin)
2) Search for the folder
Scroll through the full folder list or use the search bar at the top to locate "Sent Items" in case it was moved further down.
3) Restore it if it was deleted
- Open Deleted Items and look for a Sent Items folder
- If it's there: right-click > Move it back under your mailbox
- If it's not there: in Deleted Items, click Recover items deleted from this folder at the top of the message list, search for "Sent Items" or individual sent messages, select them, and click Restore.
Note: If you have a very large number of folders/subfolders, Outlook.com may not show every folder in the list. If you also use the Outlook app on Windows, go to View > Folder Pane > Normal to ensure the folder pane isn't hidden.
Please let me know if this proves useful to you, or if you would like further assistance.
I'm looking forward to your reply.
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