Unibox for Outlook is an add-in for the Microsoft Outlook Desktop Client for Windows. It facilitates the viewing and searching of items in common mail folders, providing functionality similar to a unified mail box.
Unibox for Outlook is compatible with Microsoft Outlook 2016 and 2019 on Windows 7, 8 and 10. It's available for both the 32 bit and 64 bit versions of Outlook. Download an evaluation copy below, or obtain a license quote here.