Sending, receiving, and organizing email in Outlook.com
I understand how inconvenient it is when a familiar selection option suddenly disappears from the inbox.
In Outlook.com, try moving the pointer over the sender’s picture or initials next to a message. The icon may change to a checkbox, allowing you to select that message and then choose additional emails before clicking Delete.
As another option, select the first message and use Shift + Up Arrow or Shift + Down Arrow to extend the selection to adjacent messages. Microsoft documents these shortcuts for selecting multiple consecutive messages in the Outlook message list.
If the selection controls still do not appear, please refresh Outlook.com, test it in a private or InPrivate browser window, and temporarily disable browser extensions to check whether the interface is being affected.
Could you also confirm whether you are using Outlook.com in a desktop browser or on a mobile browser, and which browser you are using? The available selection controls can differ between these interfaces.
You can also review Microsoft’s official Outlook keyboard shortcuts here: Keyboard shortcuts for Outlook
Thank you so much for your understanding.
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