Is a PST Merge Possible With No Outlook?
Windows has no tool that merges PST files, so you need Outlook or merge software.
Outlook merges files through import and drag and drop. Merge software opens PST files itself and creates one new file.
| Option | Needs Outlook | Fits |
|---|---|---|
| Outlook import wizard | Yes | Two or three small files |
| Drag and drop | Yes | A few folders |
| Merge software | No | Many or large files |
How does Outlook Merge PST Files?
Method #1: Import Wizard in Classic Outlook (Free With Outlook)
Who it suits. Users with Outlook and a few files. Extra application. None.
- Open Outlook and select File.
- Select Open & Export and then Import/Export.
- Select Import from another program or file and then Next.
- Select Outlook Data File (.pst) and then Next.
- Browse to the first PST file and choose how to handle duplicates.
- Select the destination folder and then Finish. Repeat for every file.
Microsoft documents these steps for classic and new Outlook.
Method #2: Drag and Drop Between Files (Free With Outlook)
Who it suits. Users who need only a few folders. Extra application. None.
Open both PST files in Outlook and drag folders from one file into the other. Microsoft recommends this route when you need only a few items.
How does Merge Software Work With No Outlook?
Method #3: PST Merge Software (Paid After Demo)
Who it suits. Users without Outlook or with many PST files. Extra application. PST Merge software.
PST Merge software opens PST files with no Outlook installed. You add a folder of files and choose how to combine them.
- Merge. Combines every file into one flat PST file.
- Join. Stores every source file as its own branch in the new file.
- Duplicate removal. Drops repeated items from overlapping backups.
Test the demo on copies of two files, then compare the item counts. Our merge multiple PST files thread shows a case with 14 files.
What should You Check Before You Merge?
- Copy every PST file to a work folder.
- Open every file once and note the item count.
- Check for password protected files and remove the password first.
- Make sure the new file has enough disk space.
Use the Inbox Repair Tool on damaged files first. Our Outlook data file errors guide explains the steps.
Frequently Asked Questions
Is Merging Possible With No Outlook Installed?
Yes, with merge software. Windows and Outlook cannot do it without Outlook installed.
Does Merging Delete the Original PST Files?
No. The merge creates a new file. Retain the originals until you check the result.
What is the Difference Between Merge and Join?
Merge combines every item into one flat structure. Join stores every source file as its own branch.
Does Merging Remove Duplicates?
Only with a duplicate option. Outlook includes duplicate handling in the import wizard, and merge software has its own option.
Can You Merge Password Protected PST Files?
Outlook asks for the password during import. Merge software needs the password or an unprotected copy.
How Many PST Files can You Merge at Once?
Outlook handles one file per import. Merge software adds a full folder of files at once.
How do You Check the Merged File?
Open it in Outlook or a PST viewer. Compare folder counts with the originals.
Author's Verdict
Use Outlook when you have two small files and a license.
Choose merge software for many files or a computer with no Outlook, and check counts afterward.
Key Takeaways
- Windows has no built in PST merge.
- Outlook merges through import or drag and drop.
- Merge software works with no Outlook installed.