This is an independent guide, not the vendor's site. Buttons lead to stellarinfo.com; if a link carries a referral code, this site may earn a commission at no extra cost to you, and it does not change the advice. Prices and terms were read on stellarinfo.com on 10 November 2026.
The Stellar Merge Mailbox for Outlook download is a Windows installer for version 8.0.0.3, offered on the vendor's product page. Without a key it runs as a demo that performs the merge or join and previews the result, mail bodies and attachments included, but does not save it. Entering the activation key from a purchase unlocks saving without reinstalling.
What you get
The button on this page sends you to the official product page on stellarinfo.com, not to a mirror. The installer there is the same file for the demo and the paid editions; the key decides what is unlocked. If you open the vendor's page on a phone, it asks for an email address and sends the link instead, because the program only runs on a Windows desktop or laptop.
The vendor publishes no file size for the installer and no checksum, so download it only from the official page. Cracked or repackaged copies circulate for most utilities of this kind; they carry no support, no refund and an obvious risk for a program that reads your mail.
System requirements
| Requirement | Value |
|---|---|
| Operating system | 64 bit Windows 11, 10, 8.1, 8, Windows Server 2012 |
| Processor | Intel compatible x64 |
| Memory | 4 GB minimum, 8 GB recommended |
| Disk | 250 MB for the installation files, plus room for the merged PST |
| Outlook | Must be installed; manual lists 2024, 2021, 2019, 2016, 2013, 2010, 2007, 2003 and Office 365 |
| Languages | English, German, French, Italian, Spanish, Japanese |
The product page also mentions Windows 7 in one paragraph, but the data sheet does not list it; do not rely on Windows 7 support. The refund policy refuses refunds when the stated requirements are not met, so check this table before you buy.
Demo and licence
The demo has no file size limit. It lets you add your files, choose merge or join, set the filters and see the outcome in a preview that includes message bodies and attachments. The one thing it will not do is write the result to disk, Office 365 or Exchange. That makes it a useful dry run: if the preview looks wrong, you have spent nothing.
When you buy, the vendor emails a download link and an activation key. Licences are sold for one year on a single system, starting at $39.99 for Standard; the price comparison explains the three editions. First purchases can be refunded within 30 days under conditions listed on the refund policy page.
Install in five steps
- Download the installerUse the button below to reach the official product page and click its download button. Save the file and double click it when the download finishes; allow the installer to make changes if Windows asks.
- Start the setup wizardThe setup wizard opens. Click Next to continue.
- Accept the licence agreementRead the end user licence agreement and click Accept if you agree.
- InstallClick Install and wait a few minutes until the progress bar completes.
- Finish and launchClick Finish and start the program. To activate a purchased copy, enter the key you received by email; the manual covers this in its Activating the Software section.
After installing
Add your PST files and run the job in demo mode first. The merge walkthrough covers adding files, choosing merge or join, the duplicate filters and the five saving targets. If you later want to remove the program, use Programs and Features in the Windows Control Panel and choose Uninstall. Not sure the tool is right for you at all? Read the verdict and limits first.
Get the installer from stellarinfo.com
Official download, demo included. Buy a key only after the preview shows the result you want.
Frequently asked questions
Is there a free download?
Yes. The installer is free and runs as a demo until you enter a key. The demo previews the merged or joined PST, including bodies and attachments, but cannot save it.
What is the latest version?
The data sheet lists version 8.0.0.3, released in December 2024, as of 10 November 2026.
Does it run on 32 bit Windows?
No. The vendor lists 64 bit Windows 11, 10, 8.1, 8 and Windows Server 2012 only, with an x64 processor.
Can I install it on a Mac?
No. It is a Windows program and also needs Microsoft Outlook for Windows installed on the same computer.
How do I activate the full version?
Buy a licence on the vendor's site; a download link and activation key arrive by email. Enter the key in the installed program to unlock saving.
How big is the installer?
The vendor does not publish the file size. It states that the installation needs 250 MB of disk space, and you also need free space for the merged PST.