Sending, receiving, and organizing email in Outlook.com
I’m sorry to hear that the emails you moved into your folders are disappearing.
To help narrow down the cause, could you please confirm whether you are using a personal Outlook.com/Hotmail account or a work or school Microsoft 365 account?
Also, is this account connected to any other mail application or device, such as Apple Mail, Outlook for Mac, an iPhone, or an iPad?
This information will help determine whether the messages are being affected by another connected application, a mailbox rule, or an organization-managed retention policy.
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