Once your data has been exported, you'll get a notification. In the Save As box, under Favorites, choose the Downloads folder, and click Save. In the Export to Archive File (.olm) box, check the items you want to export, and choose Continue.
If all Outlook updates are applied and you still don't see the Export button, look for Export on the Outlook File menu. On the Outlook Help menu, click Check for Updates. Note: Don't see the Export button? Make sure you have the latest version of Outlook.
