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How to clean mailbox

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This applies to Outlook 2019, Outlook 2016, and Office for business

Are you getting weekly or even daily messages warning that you’re about to run out of mailbox space? Mailbox Cleanup is a one-stop cleanup tool that you can use to trim the size of your mailbox.

  1. In Outlook, choose FileTools > Mailbox Cleanup.
Web page - Line
  1. Do any of the following:
    • View the total size of your mailbox and of individual folders within it.
    • Find items older than a certain date or size.
    • Archive items by using AutoArchive.
    • View the size of your Deleted Items folder and empty your Deleted Items folder.
    • View the size of your Conflicts folder and delete this folder.

If you only wanted to delete certain emails, folders or conversations only, you can check this link:
https://support.microsoft.com/en-us/office/clean-up-your-inbox-2fb652e5-b387-4147-9fff-25f2e32dfda9?ui=en-us&rs=en-us&ad=us

Source:
Manage my mailbox size

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