OST to Office 365 Migration Tool


MailsDaddy OST to Office 365 Migration Tool

The software is rated by our valuable clients.

A simple solution of migrating OST file to Office 365 mailbox. The tool effortlessly recover and migrate OST to Cloud based office 365 mailbox. The Application performs the upload operation with complete OST data including attachments.

  • One click solution to Convert & Move OST file to Office 365 cloud platform.
  • Show preview of entire OST file data along with attachment prior importing to Office 365.
  • Upload all OST data like Emails,Attachments, Contacts, Calendars & Tasks etc. to Office 365.
  • You can migrate selected emails as well as selected folders from OST file to Exchange Online.
  • OST to Office 365 migration tool maintains the folder hierarchy & HTML formatting.
  • Import OST files to Office 365 mailboxes with impersonation.(Applicable on Business and      Enterprise License)
  • Upload Multiple OST Files to Diffrent O365 Accounts using Bulk Export option .(Applicable on      Business and Enterprise License)
  • Compatible with all Windows OS including Windows 10, 8.1 , 7, Vista, XP & all earlier versions.
  • Convert Corrupted, Exchange server, IMAP & Hotmail OST files to Office 365 OWA account.

Installation   Uninstallation   End User License Agreement


We are confident about our applications. You may try free demo, compare with other tools then purchase full version.


Some Features of Exchange Server OST to Office 365 Import Tool


Search/Add Outlook OST File

Add the OST file that you need to upload to Office 365. You can also search for the OST file by clicking on the search icon if you don't know the OST path.

Previews OST File with attachment

The OST to Office 365 migration tool previews the entire content of OST file along with attachment. Click on particular email to read its data.

Migrate OST to Office 365

The application provides simple solution with which one can easily import OST to Office 365 mailbox. Click on Export button and Choose Office 365 option to upload OST to Office 365.

Maintains Folder Hierarchy

The software migrates OST to Office 365 platform and maintains the original folder hierarchy. The tool uploads the OST file as it is to Office 365 platform.



Import Multiple OST Files to Office 365 Accounts

The tool provides BULK Export feature by using which you can simply migrate multiple user mailboxes to Office 365 at one go. In order to use this feature you need to create a CSV file containing OST file paths, O365 email IDs & Passwords. Learn More →

OST to O365 Migration with Impersonation

Impersonate Export helps administrators to perform batch migrations without requiring passwords. In order to use this feature you need to provide ApplicationImpersonation rights and Full access role to the Admin Mailbox. Learn More →

Upload OST Files to Office 365 Primary Mailbox

By selecting this option you may move OST file data such as emails, contacts, tasks and calendar items to Office 365 default folders. The software preserves the same folder structure while migrating OST data to Exchange Online Primary Mailbox. Learn More →

Migrate OST Data to Exchange Online Archive Mailbox

If you don't want to import OST file data to main folders of Office 365 mailbox then you may use Export to Archive Mailbox option. If this option is checked, then the software will create a new folder on Office 365 mailbox and import entire data inside that folder. Learn More →



Migrate Contacts Only & Calendar Only

MailsDaddy OST to Office 365 migration tool allows importing contacts only, importing calendar only or importing contact and calendar only to primary as well as archive mailbox. If you want to migrate contacts and calendars then this option will be helpful.

Pause & Resume Migration

This is another good feature which allows users to pause or resume the process in between OST to Office 365 migration. The software will automatically pause if there is any problem with your internet connection and will resume once Internet connection is available.

Create Log reports of Migration

You don't need to worry about migration errors, missing items or anything else. Our software will create a log file into the selected destination location and will generate a report of migration. It will be helpful to analyze the OST to Office 365 migration procedure.

Advance Date Range Filter

If you are working with an organization from very long time and want to keep 1 year, 1 month or other specific date range data while moving to Office 365 then this option will work like a charm. You can select from and to date range and upload required OST data to Office 365 account.



Import Selected Items to Office 365

Import selected items of OST file to Office 365 mailbox. Just check the emails that you want to migrate to Office 365 mailbox and click on Export button.

Maintains All Mail Property

The software preserves the entire email properties like To, CC, Bcc, Subject and From etc. Also the application maintains read unread status of emails.

Support Corrupted or Offline OST Files

The OST to Office 365 Upload Tool is capable of importing Offline or Corrupted Exchange OST file to Office 365 platform.

No Outlook or Exchange Server Required

OST file to Office 365 importer is an independent tool and does not requires setup of Exchange Server or Outlook to Move OST to Office 365 platform.



Why companies are migrating to off premise cloud platform?

The office 365 is a cloud based service developed by Microsoft which enable users in accessing the Microsoft applications like Exchange Online, Office and One Drive etc. Due to the advanced functionality of these applications most of the organization has started using these services. Some of the main reasons because of which organizations are migrating to Office 365 are:

  • The office 365 removes the dependencies from local servers.
  • Reduces the maintenance cost
  • Access anywhere and from any device

How to Import OST mailboxes to Office 365 User Account?

You can convert your OST files to .pst extension and import them with a few manual steps. But entire process is not so easy and its take a long to complete the task. If you have number of OST file to be imported on Office 365 and you are going to manual method then it will be hectic task.

So we will recommend you to download MailsDaddy OST to Office 365 migration tool that will transfer all or selected data from your OST files to Office 365 easily.

Stepwise Guide to Make Sure How to Upload OST File to Office 365 Platform


Watch Online Video to Ensure How to Export Data from OST file to Office 365

MailsDaddy OST to Office 365 Migration Tool Demo Limits & Specifications

By using the free edition of OST to Office 365 Import Tool you can migrate 20 items from OST file to Office 365 Mailbox.

Product Specifications:

Application Name: MailsDaddy OST to Office 365 Migration Tool
Developers: MailsDaddy Software
Latest Edition: 5.1
Size 5.28 MB

System Requirements:

Processor & RAM: Minimum 2.4 GHz Processor and 1 GB RAM
Minimum Hard Drive Space: 20 MB
Supported OS: Windows 10, 8.1, 8, 7, Vista, XP and All Older Editions (32-bit & 64-bit)
Supported Outlook Editions: Microsoft Outlook 2016, 2013, 2010, 2007, 2003 and all previous editions (32-bit & 64-bit)

Frequently Asked Questions of MailsDaddy OST to Office 365 Importer

No, The OST to Office 365 migration tool does not requires the installation of Exchange Server or Outlook application.
Yes, you can easily migrate selected folder of OST file to Office 365 platform.
No, upload OST file of any size to Office 365 mailbox with an ease.
Yes, you can easily import Corrupted or Offline OST file.
Yes, the tool supports OST file of Outlook 2016, 2013, 2010, 2007 and all earlier versions.
No, BULK Export & Impersonate Export options are not applicable with Personal License. You may purchase Business License or Enterprise License to unlock these advance features. If you have already purchased Personal License then contact to sales team they will help you to upgrade the license.
Yes, you need to enable ApplicationImperonation rights by login to Global Administrator account and also need to give Full Access role to the admin for each mailbox. To learn how to give these permissions you may read our blog.