OST to Office365 Converter

Import OST to Office365 account with all email messages, contacts, calendar, and all other stuff using OST to Office365 Migrator tool. Try this specially designed program to effectively complete this OST Office365 migration.

  • Migrate single as well as multiple OST files to Office365 at once.
  • Import OST files of any type and any size with the same process.
  • OST file data import to Office365 Primary Mailbox or Custom folder.
  • Get Folder selection, items preview, mail filter, & many more features.
  • Complete the migration without MS Outlook application dependency.
OST to Office365 Migration tool

Key Features of OST to Office 365 Migration Software

OST to Office365 converter

Instant Fast Software Delivery via Email

30 days return policy

  • Swiftly export Outlook mailbox items from the OST file to Office 365 account mailbox.
  • Migrate a single OST file as well as migrate multiple OST files in batch mode with ease.
  • Shows all Outlook items from OST files including emails, contacts, calendars, & other items.
  • Export all data easily from all orphaned, corrupt, or encrypted OST files without any problem.
  • Choose required folders from OST files and export Outlook items from specified OST folders.
  • Save/Import OST file data to Office365 primary mailbox, archive folder, or custom folder.
  • Get the mail filter function to move emails of chosen dates from mail folders of OST files.
  • Migrate selected folders from OST files to Office365 and preserve each folder in the same order.
  • No requirement for MS Outlook or Exchange environment for OST to Office 365 migration.
  • Additionally, export OST to Gmail and all other IMAP-based web and cloud mail apps.
  • Supports to migrate OST files of all MS Outlook editions- 2021, 2016, 2013, and below editions.
  • Has a simple interface to assist users in uploading data from OST file to Office 365 account.
  • Compatible with all editions of Windows O/s including- Win 11, 10, 8.1, 8, 7, and other versions.

Free Demo:- Upload 25 items from each chosen folder of OST to Office 365 for free.

All Features of OST to Office365 Converter Software

Import/Upload OST to Office 365 cloud account

One of the most asked questions is related to the ways to import & upload Outlook OST mailboxes to Office 365 account. As it is a tough task, so eSoftTools has presented an automated solution called Best OST to Office 365 Converter Software. This is the advanced solution to repair corrupt and damaged OST files & export OST to Office 365 successfully.

It will allow you to import OST files to Office365 mailbox in batch mode. Simply it exports single or multiple OST files to Office365 along with emails, calendars, notes, contacts, journals, and other elements. Move OST file data and save to primary mailbox, custom folders, or archive folders of Office365 account.

Working process >> How to Export OST to Office 365 account?

migrate ost to office365
migrate OST to O365 in bulk

Single and Bulk OST selection

    With the software, users will get 2 distinct options for adding OST files to perform the migration task: -

  • Single OST file: - Search or select an OST file from your drive and add a single OST file.
  • Bulk OST file: - Add a folder having multiple OST files to convert all OST files at one time.
recover/repair OST files

Scan and Repair OST files

Recover data from corrupt, orphaned, encrypted, and damaged OST files with simple mouse clicks. Scan your inaccessible OST files and move all data from these OST files to Office 365 account. Use this Outlook OST to Office 365 Migration to simply repair damaged or corrupt OST files & save their data to Office 365 account.

open/view ost files

Preview Outlook items

Before uploading OST file to MS Office 365, scan OST files and get a clear preview of all their inner elements. See all mail folders and other available data items of Outlook profiles from OST files. Use the software as a free OST viewer tool and get a preview of all OST files' inner data in their original format.

migrate chosen OST folders

Import Selective OST Folders

This software provides a unique facility where users can pick their needed folders from OST files and import them to Office 365. This accelerates the process of the entire conversion and moves only selective OST folder data to Office 365 mailbox. Import all items from the selected folders in Office 365 cloud account and preserve them in exact hierarchical order.

maintain all information

Preserve Emails with all attributes

The software enables users to complete the migration while preserving folder structure and email formatting. eSoftTools Outlook OST to Office 365 Conversion Software ensures not to make changes and restore emails with all email attributes comprising to, bcc, cc, time, subjects, attachments, from, and other information.

export ost emails to Office365 of selected dates

Export emails of chosen dates

Upload emails of chosen dates from OST file to Office 365 cloud with the mail filter function. This option enables users to select the dates of emails for migrating only required emails from OST files. Users can define a start date and end date and the software uploads emails that come into the specified date range.

Migrate OST without MS Outlook

No MS Outlook requirement

eSoftTools Free OST file to Office 365 converter is an application that allows exporting Outlook OST files into Office 365 without the need for MS Outlook application. The software only requires your OST files and Office365 account login details during the migration. After inputting the required things, the software uploads OST to Office365 account without Outlook dependency.

all MS Outlook edition support

Supports all MS Outlook editions

No need to be worried about the Outlook edition because the software supports OST files of all MS Outlook editions. This free OST to Office 365 Migration Software will migrate OST files (ANSI & Unicode) of all new to oldest editions of MS Outlook. It can Export OST files of MS Outlook- 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2000, and earlier editions.

smart graphical interface

Advanced & Easy-to-use GUI

The well-designed and easily understandable graphical interface helps all types of users access the software with ease. With a few simple clicks, users can accomplish the OST to Office 365 migration job. All users with prior technical experience as well as those with zero technical knowledge, can easily handle the migration job with this software.

windows compatible

All Windows O/S edition support

This tool is not limited to a single edition of the Windows operating system. A user can run this software on all computers having any edition of Windows O/s. This software will work perfectly on all Windows versions including- Windows 11, 10, 8.1, 8, 7, Vista, XP, and older editions.

Free Export OST to Office365

Free OST to Office 365 conversion

A facility to try this tool for free is offered to every single user. At free of cost, it exports up to 25 items from each chosen folder of OST file to Office 365 account. With this demo edition, all Outlook/Exchange OST file users can directly migrate to Office365 accounts without any restriction on size and edition.

Additional available migration options

Migrate OST to Gmail

Import OST file into Gmail

With this software, users can also migrate OST mailbox to Gmail and Google Workspace accounts. It will Export OST to Gmail with emails, contacts, calendars, and other mailbox items. Also, get smart functions like- folder selection, mail filter, email preview, and more for performing the best OST to Gmail migration job.

migrate OST to Imap

Import OST to IMAP account

Outlook mailbox folders export from Outlook OST to IMAP-based mail apps. Directly import OST files with all mail folders and other objects to all IMAP-based cloud and webmail apps like-, Yahoo Mail, Yandex Mail, AOL Mail, Bluehost, GoDaddy, and more. It will move and save all OST mailbox folders with their inner data items into IMAP account without any miss.

Note:- OST to Gmail and IMAP migration is available in the corporate and Technician License

Software Comparison

Software Features Trial Version Full Version
Migrate OST to Office365 account
Single or Bulk migration option
Open/View Outlook OST files
Upload to Gmail and IMAP account
Mail filter and new folder input
Unlimited OST to Office365 migration Uploads 25 items from each folder of OST file.
Download Now BuyNow

Software Specification

Trial Limitations

The demo edition helps users to import 25 items from each folder of OST file to O365 account for free.

Software Info


Supported App

MS Outlook/Office365

Personal, Corporate, Technician

Language Supported
English, German, Italian, French, Spanish

System Requirements

Intel® Pentium Class

Operating System

Hard Disk Space
50 MB of free hard disk space

Minimum 512 MB is required

Software Delivery


Delivery by E-mail

Supported Windows OS

Works with all windows O/S editions 11, 10, 8.1, 8, 7, XP, Vista, & below editions

Frequently Asked Questions (FAQ)

  • Download and launch eSoftTools OST to Office365 migration software.
  • Press the Select OSTbutton, and select a OST file-adding mode -
    • Single OST File Conversion: - select and import a single OST file for import process.
    • Bulk OST File Conversion: - At one time add multiple Outlook OST files for migration.
  • Import OST files and press the Start Scanning button to load all OST file data
  • Get a preview of all Outlook mailbox items from OST files and select required folders.
  • Choose needed folders and click the OST to Office365 Migrate button.
  • Enter Office365 account email address and select other options- Import options, mail filtering, etc.
  • Press the Convert button after all selections and start OST to Office365 migration.
OST to Office365 Migrator

Check the complete process, by visiting here: - How to Migrate OST to Office365 account?

This OST file to Office 365 Converter could be a standalone tool to complete this OST to Office365 migration job and offer the best results without generating a single error.
This tool can efficiently migrate OST files to Office 365. But in case, you are looking for a tool to convert OST to PST file, then try eSoftTools OST to PST Converter Tool. It enables users to Convert OST files into PST, EML, EMLX, HTML, MSG, vCard, MBOX, and many more file formats.
The software only needs Outlook OST files and Office 365 account login details to begin and complete the migration.
No, there is no need to install the MS Outlook application for running this OST to Office 365 Export Software. Without Outlook requirement, it exports all data from OST file to an Office 365 account.
Yes, this eSoftTools OST to Office 365 Export Software supports all types OST files for migration (including- corrupted, orphaned, encrypted, damaged, as well as healthy OST files).
Yes, this OST to Office 365 Migration Software allows users to export calendars, contacts, and other folder items from OST files.
You can convert multiple OST files at a single time without any restrictions. At one time users can migrate unlimited OST files to different sizes with ease.
Yes, users can also do this job with this single software. This feature is available in the corporate and technician licenses of the software. Users can easily migrate OST files to Gmail, and other IMAP-based mail apps.
No, this tool only supports migrating OST to Office 365 and other cloud mail apps. But users can try to convert OST to EML with eSoftTools OST to EML Converter Tool.

Client Most Valuable Review's

(Rated 5 Star)
eSoftTools OST to Office365 goes above and beyond my expectations. A few times back I am looking to import OST to Office365, I look over more than articles but no one helped me and I got more confusion about how to access emails on Office365. I do searching over Bing! and reached over the eSoftTools blog area where I saw, a tool eSoftTools OST to Office365 is available to fix my problem. Then I try the evaluation version and check the software efficiency. After that, I decided to go with licensed software and import my OST file to Office365 without any problem. Good work team.
[ Jean Espinasse ]  [ France ]
(Rated 5 Star)
A year ago, I purchased this software to export OST files to my Office365 account. I have also used its bulk migration features which have allowed me to move over 100 OST files at one time. All OST files have been exported to Office365 with complete data in a very short time. I want to say thanks to the eSoftTools developers for creating this amazing utility.
[ James Webb ]  [ United States ]
(Rated 5 Star)
With this software, I have exported emails from some orphaned OST files to Office365 and my Gmail account. It helped in doing this job of migration with a simple process. This tool has moved all of my OST files into Office365 cloud without making a single modification to their inner data items.
[ Mary Himes ]  [ United Kingdom ]
(Rated 5 Star)
For a very long time, I have been using this software to transfer Outlook OST files to Office365. It smoothly exports all data items from OST files to Office365 account. The best feature that I have seen in this tool is folder selection which allows users to export chosen folders from OST files. It works amazingly to migrate data from OST files.
[ Verna Zollinger ]  [ Switzerland ]
(Rated 5 Star)
I have never used this kind of tool in my life before, but after using this OST to Office365 migrator I found the best results. It helped me in performing OST to Office365 migration with zero effort. In addition to Office365, I have also used this software to migrate OST files to Gmail and Yahoo Mail and it has completed all the tasks accurately.
[ Brandon Chick ]  [ Spain ]