Aryson PST Merge: Complete Guide to Combining Multiple PST Files

Aryson PST Merge Review: Features, Pros, and Step-by-Step Tutorial

Date: March 7, 2026

Overview Aryson PST Merge is a Windows utility designed to combine multiple Outlook PST files into a single PST while preserving folder hierarchy, email attributes, and attachments. It targets users who manage several PST archives and want to consolidate them for easier access or migration.

Key Features

• Merge Modes: Merge multiple PSTs into one, join folders with the same name, or merge contacts/calendars separately.
• Selective Merging: Filter items by date range, folder type (mail, contacts, calendar), or include/exclude specific folders.
• Duplicate Handling: Options to skip duplicates, add prefixes/suffixes, or create separate folders for conflicting items.
• Compatibility: Supports ANSI and Unicode PSTs and works with Outlook 2019/2016/2013/2010 and earlier.
• Preview & Search: Preview mailbox items before merging and search within loaded PSTs.
• Large File Support: Handles large PSTs and can split output PSTs if they exceed a user-defined size.
• Logging & Reports: Generates logs of merged items and produces summary reports for auditing.
• User Interface: Wizard-driven UI for stepwise merging and a GUI suitable for nontechnical users.

Pros

• Simple workflow: Wizard-based steps make it straightforward for most users.
• Flexible options: Multiple merge modes and filters let users tailor the process.
• Preserves data integrity: Maintains folder hierarchy, metadata, and attachments.
• Duplicate controls: Built-in duplicate handling reduces manual cleanup.
• Good compatibility: Works with a wide range of Outlook versions and PST formats.

Cons

• Windows only: No macOS or Linux version.
• Paid license: Free trial exists but full functionality requires purchase.
• Performance on huge PST farms: Can be slow when processing hundreds of large PSTs without powerful hardware.
• Limited automation: Lacks advanced scheduling or command-line options for unattended bulk processing in some editions.

When to Use It

• Consolidating archived PSTs from multiple accounts or machines.
• Preparing PSTs for migration to a new Outlook profile or for import into mail servers.
• Cleaning up duplicate or fragmented mailbox stores.

Step-by-Step Tutorial: Merge Multiple PST Files into One Assumptions: You have Aryson PST Merge installed on a Windows PC and Outlook is closed. Use reasonable defaults if prompted.

1. Launch Aryson PST Merge.
2. Choose the merge mode:
   • Select “Merge PST” to combine multiple PST files into a single PST while preserving folder structure.
3. Add PST files:
   • Click “Add File” (or “Add Folder” to include all PSTs in a directory).
   • Browse and select the PST files you want to merge.
4. Preview contents:
   • Select a loaded PST from the list and use the preview pane to inspect folders and items.
5. Set filters (optional):
   • Open Filters and choose date range, item type (mail/contacts/calendar), or specific folders to include/exclude.
6. Configure duplicate handling:
   • Choose one of the duplicate options: Skip duplicates, Keep both (rename), or Create separate folder.
7. Select output:
   • Specify output PST file path and name. If desired, enable “Split after size” and set the max PST size.
8. Advanced options (optional):
   • Enable logging, include deleted items, or preserve folder permissions if available.
9. Start merge:
   • Click “Merge” (or “Start”) and wait. Progress indicators and logs will display status.
10. Review results:

• Once complete, open the output PST in Outlook (File > Open & Export > Open Outlook Data File) to verify merged content.

11. Check logs:

• Inspect the generated log/report for any skipped items or errors.

Tips and Best Practices

• Back up original PSTs before merging.
• Run the merge on a machine with sufficient RAM and disk I/O for large PSTs.
• If Outlook is installed, ensure it’s closed during merging to avoid file locks.
• Use filters to limit the merge scope and speed up the process.
• Test with a small subset before merging large archives.

Alternatives to Consider

• Native Outlook export/import (manual and slower).
• Other third-party tools with command-line support or server-side migration features if you need automation.

Short Verdict Aryson PST Merge is a capable, user-friendly tool for combining PST files with useful filters and duplicate handling. It’s well-suited for desktop users needing a straightforward GUI solution, though enterprises needing large-scale automation may require more robust, scriptable alternatives.