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Click in the Search box and type: messagesize:5 mb. You can delete some or all of these messages or move them to another Outlook Data File (.pst).For more information on moving items, see Move or copy a message between folders.

If you delete items from an Outlook Data File (.pst), the file is automatically compacted in the background when you’re not using your computer and Outlook is running.

You can also manually start the compact command immediately.

If you delete items from an Outlook Data File (.pst), the file is automatically compacted in the background when you’re not using your computer if Outlook is running.

You can also manually start the compact process immediately.

If you use an Office 365, Exchange, or account, a copy of your mailbox is stored in an Offline Outlook Data File (.ost).