OST File Merge Tool




SysTools OST Merge Software

To manage multiple OST files in a hassle-free way, just merge OST files into a single pst 1 file via SysTools OST Merger software. With this utility, one can combine multiple Outlook OST files into one pst 1 file in just a few clicks. The user can work with the software without any 2GB file size restriction.

(Average Rating 4.4 Based on 49 Reviews)
  • Combine multiple Outlook OST data files into a single pst 1 File.
  • Merge 2 OST Files with All Items such as email, address book etc
  • Tool provides 3 options : Join OST Files, Merge OST Files & Merge Contacts Only
  • Facilitate option to Merge Unicode OST & ANSI Data File both
  • Merge two OST files by removing the duplicate data optionally
  • OST file combiner merge all OST file data into single folder.
  • No 2 GB file size limitation on Outlook OST file merge tool
  • Option to Exclude Deleted Items while merging OST files
  • OST Merge Utility allows to Generate Report in PDF or CSV File
  • MS Outlook Installation is Required to Combine OST File

Free Live Demo - SysTools OST Merge Tool Fully Secured Download Version

SysTools OST Merge Wizard Awards & Reviews

An Advance Merge Outlook OST Tool To Combine OST Files

Users Reviews

Expert Reviews

Prime Features of Outlook OST File Merger Tool

A Magnificent Solution to combine Outlook OST files Easily

Combine Multiple OST files

Multiple Option to Add OST File

The software provides two different options to insert the OST file into the software’s dashboard and perform the merge process. The user can make use of Add Folder / Add File option to combine OST files into a single pst 1 file.

  • Add Folder: This option permits the user to combine two or more than two OST files into a single pst 1in bulk.
  • Add File: With this option, one can insert a single OST file at once and combine it.
Merge two or more OST files

Customize OST File Merge Process

The software renders multiple options to combine OST files which makes it easy for the user to select the appropriate option and implement the merge process. Different modes offered by the tool to merge two OST files in Outlook are Join, Merge and Merge Contacts. The user can select any of the options according to requirements and choice.

  • Join OST: With this option, one can merge the OST file with the creation of a new folder for the combined OST as a single pst 1 file.
  • Merge OST: This option permits the user to combine identical folders into single pst 1.
  • Merge Contact: One can easily merge Contacts present in the OST file as pst 1 with this option.
Join multiple OST file

Merge Different OST Files

With SysTools OST Merge software, one can easily combine multiple OST files into a single pst 1 of UNICODE type in a seamless way. The software permits the user to merge numerous OST files into pst 1 file irrespective of the file size. After combining multiple OST files into a single pst 1 file, it becomes easy for the user to manage them efficiently.

Detailed Features of OST Merge Software

Instantly Join, Merge & Combine OST Files without any Duplicate Items

join mutiple OST files

Merge Multiple OST Files

Combine Multiple Outlook data files into a single file of UNICODE type using OST Merge software. This application is built to provide the easiest way to merge multiple OST files or large number of OST files into single pst 1 file for easily manageable storage. The software merges similar folders containing distinct OST files into a single folder. The tool also provides facility to split file during merging when merged OST file size exceeds.

Options to Combine OST file

Options to Combine OST Files

The OST merge software provides multiple modes to merge two OST files in Outlook including : Join, Merge and Merge contacts option. Users can select any of the option to load OST files in it:

  1. Join OST : This optiona allows users to combine OST File by creating new folder for merged OST as a single pst 1 File
  2. Merge OST : This Option allows users to merge similar folders into single pst 1.
  3. Merge Contacts : This option allows users to merge only Contacts within OST File as pst 1 Read More

Combine OST file contacts

Combine ‘Contacts Only’ Folder

This particular option is provided for combining the ‘contacts only’ from various OST files processed by using the merging OST files tool. This software merge 2 OST Files to create a single pst 1 having only integrated contacts into one and keeps the meta properties of the contacts together

Combine Unlimted OST files

Merging Unlimited OST Files

There is no size limitation imposed on the quantity of data to be combined using OST Merge software. The tool provides 2 Options : Add File & Add Folder for combining multiple OST at once. Users can easily merge two OST files into one pst 1 and the software performance would not be affected by the quantity. There is no limit on the size or quantity of Outlook OST files.

Exclude Deleted Items

Allows to Exclude Deleted Items

If users merge 2 OST files into one pst 1 & do not want to combine deleted items folder of Outlook data files, then check the option to exclude deleted items option. The tool will not combine the deleted folders into resultant pst 1 file and this will take less time during merging OST files.

Add files and Add folder options

Provide Add Folder / Files Option

The OST merge software offers ‘Add Folder’ option to merge two OST files or more than 2 at a time to integrate Outlook folders in bulk. Otherwise, if the user wants to add a single file at once, they can select ‘Add files’ option as per their choice.

exclude duplicate items

Exclude Duplicate Items

When merging Outlook OST files in bulk, users can customize the process for enhancing the procedure of Outlook OST file merge. Users are capable of excluding Duplicate Items as well as Deleted Items from being merged, or both while merging OST files.

Generate Report

Reporting in PDF or CSV

Before merging OST file , the OST Merge software provides option top create migration report in PDF. User need to check this option to generate a report after completion of Joining process. If the option is uncheck, by default a report will be generated in CSV File.

OST Merge Tool Specifications
Download Outlook OST Merge Software to Merge Multiple OST Files

Software Download

Download Now

Size : 41.1 MB

Version : 5.0

MD5 : b37a09f021ba0a981edb25839147acd1

Trial Limitations

Free Trial version of OST Merge Software will join only first two folders of each OST files & merge only 15 items of each folder of OST files

System Specifications

Hard Disk Space
Around 100 MB of free hard disk space

Minimum 4 GB of RAM is required

Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz2.39GHz

Application Prerequisites

  • Microsoft Outlook must be installed and must be configured properly for any valid or dummy profile/account.
  • If you are using Windows 11/10/8.1/8/7, then please launch the tool as "Run as Administrator" .
  • To Import Merged OST into Active / Existing Outlook Profile Read More

Supported Editions

Microsoft Windows – Windows 11 (64-bit), 10, 8.1, 8, 7 (32-bit & 64-bit), Windows Server 2008 / 2012 / 2016 / 2019

Additional Software

Microsoft .NET framework 4.5

Product Guides

Software Guide Installation Uninstallation EULA


Electronic Delivery


Get an Overview of OST Merge Features - DEMO versus Licensed Version

Features DEMO Version FULL Version
Add OST Files & Folder
Remove duplicate Emails
Exclude Deleted Items
Generates Export Report in PDF & CSV
Join OST Files Join First 2 Folders All Items
Merge Outlook OST Files Merge First 15 Items/ Folder All Items
Merge Outlook Contacts Merge First 15 Contacts All Items
Cost FREE $39

Frequently Asked Questions

Listed Commonly Asked Questions and Answers

How Can I Use SysTools OST Merge Tool to Merge Outlook OST files

OST merge tool screen

Follow the steps to Combine OST Files Easily:

  • Step 1: Install & Run Merge OST Tool
  • Step 2: Add OST File(s) & Folder for Combining
  • Step 3: Choose from 3 Option : Merge OST, Join OST & Merge OST Contacts
  • Step 4: Option to check Remove Duplicates while merging OST
  • Step 5: Exclude Deleted Items when joining OST folders into one pst 1
  • Step 6: Choose Destination Path for Merged OST files
  • Step 7: OST File combiner Save Report in PDF or CSV File
  • Step 8: Successfully Merge 2 OST Files into single pst 1 file.

“Accidentally I have selected same files twice and I want to delete those duplicate items while combining Outlook data files. Therefore I want to know that using OST merge software can I remove the duplicate data during the merging process and combine 2 OST Files.”

Yes, there is an option “Remove Duplicates” provided by the OST Merge tool to merge multiple ost files. If you check this option while performing the merge OST files process, then, you will get the resultant file free from duplicate entries.

"I am having two or more Outlook OST files and now I want to join them in a separate folder. So Is there any option to merge multiple OST files in bulk given by the OST file combiner software?"

There are 3 different options provided by the tool to integrate Outlook OST files such as Join Multiple OST file, Merge OST files in bulk and Merge Contacts folder only. The user can opt any one of them as per their choice.

Recently I am having numerous of files and folders to be merged from more than 2 OST files. Doing this is making it complicated. Is there a way to combine OST files into one without having to go through all this complication?

Yes, the Outlook OST file merge tool is one of the best software that simplifies the procedure by allowing you to combine OST files in batch or via individual selection.
Yes, this Tool allows user to Merge 2 OST Files of Outlook to provides user with a single pst 1 File.
Yes, OST software permits the user to merge contacts only from different OST files at the time of merge process.
Yes, the tool is capable to merge OST files associated with Microsoft Outlook different versions such as Outlook 2021 / 2019 / 2016 / 2013 / 2010 / 2007 / 2003.
There are no security breach or formatting issues associated with the SysTools OST Merge tool. One can work with software without any hassle.
Yes, MS Outlook must be installed on the user’s system to merge multiple OST files into a single file using SysTools OST Merger.

What Customers Are Saying

SysTools Outlook OST Merge Software Verified Purchase Reviews

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