Merge Stores for Outlook: Combine PST/OST Files

Key Features

• Free tool for merging selected Outlook mailboxes and PST data files into the specified store.
• When you store Outlook archives in PST files, use Exchange Server and Office 365 Online Archives, multiple mailboxes, move from one email service provider to another, and other situations, you may need to merge multiple PST data files or mailboxes into one.
• Outlook does not provide tools to perform these operations automatically.

Technical Specifications

• **Publisher:** Outlookfreeware.com
• **License:** Freeware
• **Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
• **Last Updated:** October 15, 2025
• **Category:** Email / Misc Email Tools