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To search all mailboxes in Microsoft Outlook, follow these steps:

Open Outlook and click on the “Search” box at the top of the window.

In the “Search” tab that appears, click on “All Mailboxes”.

Enter the search query in the search box. You can search for keywords, sender, recipient, or any other criteria.

Press Enter or click the “Search” button.

Outlook will search all of your mailboxes, including your inbox, sent items, and any other folders, for emails that match your search query. You will see the search results listed in the main window.

Note that searching all mailboxes may take some time, especially if you have a large number of emails. To speed up the search, you can refine your search criteria by using filters or advanced search options. You can also limit the search to specific mailboxes or folders by selecting them in the “Search” tab.