Import your messages or account from Outlook Express to Outlook
https://support.microsoft.com/en-us/office/import-your-messages-or-account-from-outlook-express-to-outlook-ca8ecaab-3330-46a1-b925-deac3f3c4359
WebMicrosoft Outlook Express is a free, basic email program. You can import email messages and account information from Outlook Express into Microsoft Outlook. In Outlook Express, each mail folder corresponds to a single file. For example, the Inbox folder in Outlook Express is a single file, Inbox.dbx.
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