Stellar Merge Mailbox for Outlook: An Ideal Solution for Merging Multiple PST Files

MS Outlook stores all the mailbox data in Personal Storage Table (PST) files or Offline Storage Table (OST) files. When you add a new email account to Outlook using a Post Office Protocol or POP account, the mailbox data is stored in the PST format. PST files act as a repository of your mailbox data. 

If you create multiple Outlook accounts, then it can lead to the accumulation of numerous PST files. Having too many PST files can cause problems. It gets really hard to keep track of everything. You might have important emails scattered across different files, making it difficult to find the emails. Plus, having too many PST files can slow down Outlook.

So, to streamline and manage your entire data, you can merge PST files. If you’ve a few PST files, you can merge them manually. But if you have many large PST files, manual methods are not suitable. The better option is to use a professional PST file merging tool, like Stellar Merge Mailbox for Outlook. This tool makes the PST files merging process easy and quick. Let’s explore this PST merge tool and see how easily it can merge PST files.

About Stellar Merge Mailbox for Outlook 

Stellar Merge Mailbox for Outlook is a dedicated software that merges multiple PST files into a single file. It adeptly handles large PST files and even those secured with passwords. Users are presented with the flexibility to either create a new PST file after merging or integrate the merged PST into an existing one. 

Additionally, the software supports exporting the consolidated PST directly to live Exchange, Office 365, or an Outlook profile. Before saving the data, it offers complete control over the data selection from the PST files as users can exclude deleted or unnecessary items.

The software efficiently merges PST files and saves the output at the designated location. Although the process is swift, the merging duration depends on the cumulative size of the PST files.

Stellar Merge Mailbox for Outlook is a cost-effective, premium solution known for its efficacy. The best part is that it has a trial version that is available at no cost. It allows users to scan the files and preview the mail items. However, activation of the full software version is required to save the merged file.

How to Use Stellar Merge Mailbox for Outlook?

Stellar Merge Mailbox for Outlook has a simple and clutter-free user interface that makes it perfectly well-suited for even non-technical users. Let’s see how this tool works. 

Step 1: Visit Stellar’s website and download Stellar Merge Mailbox for Outlook. Opt for the free variant for initial testing. Open the installer, follow the on-screen instructions, stick to the default configuration settings for optimal setup, and install the software. 

Step 2: Launch the software post-installation. The primary interface offers the options to choose the PST files. You can add the files you want to merge using the drag-and-drop feature or by clicking the “ADD PST” button. You can also find the PST files by using the ‘Find’ button if you don’t know the location of your files. This lets you search and select the PST files directly from your system storage. Proceed by clicking ‘Next.’

Step 3: When you select the files, Stellar Merge Mailbox for Outlook scans them and previews the mail content of the selected PST files. From the Preview window, you can select the data you want to merge. This ensures you only get the data you want. Once you have confirmed the selection, click the “Merge” button. 

Step 4: Choose the Merge to new PST File option to merge the files and select a location to save the merged file. Stellar Merge Mailbox for Outlook also offers option to integrate them directly into a Microsoft 365 account or an existing Outlook Profile. 

Step 5: Once your files are merged, you will get a notification about the same. Now, you can access the merged PST file by importing it into Outlook. 

Pros and Cons of Stellar Merge Mailbox for Outlook


  • The software can merge PST files of any size.
  • It has easy-to-use interface, suitable for even non-technical users.
  • It maintains integrity of data after merging 
  • It offers filters to remove deleted and duplicate items.
  • It creates detailed logs of the merging process.
  • It can save merged PST files in new PST and can export directly to Office 365 or Exchange server account.



  • The free trial version of the software has limited features.
  • Though the software is easy-to-use for most people, some non-technical users might need some time to get used to it or understand all its features.


Pricing Plans

Stellar Merge Mailbox for Outlook costs $39/year, covering everything. But if you buy Stellar Toolkit for Outlook, it includes multiple other tools along with Stellar Merge Mailbox for Outlook. It will cost $199/year. It’s specifically designed for professionals and businesses dealing with PST files regularly. 


If you’ve multiple PST files, you need to manage the files appropriately to avoid any performance issues in Outlook. If you’re looking for a reliable and professional solution to merge multiple PST files, then Stellar Merge Mailbox for Outlook is a perfect choice. It is easy-to-use and offers various features, like removing duplicate and deleted emails while merging PST files. The software merges multiple PST files into a single file in just a few simple steps. 

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