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MailsDaddy OST to Office 365 Migration Tool

A highly skilled software for OST to Office 365 migration with emails, contacts, notes, calendar, tasks, meetings, journals, etc. This tool is an effortless solution to convert OST to Office 365.

  • Import single OST file to a single Office 365 account.
  • Convert multiple OST files to multiple Office 365 accounts.
  • Transfer OST data to Exchange Online Impersonate mailbox
  • Preserves the folder hierarchy and protects the mail properties.
  • Migrates Corrupted, IMAP, Exchange server and Hotmail OST files to Office 365.
  • Upload OST data file to MS Office 365 Primary or In-Place Archive mailbox.
  • Move all or the selected items or folders
  • Supports all MS Windows and Outlook versions.

Exclusive 10% discount

To get 10% discount use the JDSW10 coupon code during checkout.

Extra features of this OST to Office 365 Converter

Upload OST to Office 365

The application moves all the OST files to MS Office 365 in just a few minutes whether it is corrupted, orphaned, Exchange server, Hotmail or IMAP OST files.

Search, Add & Preview

The tool has the advanced multiple search options to add the OST file and allows preview of all OST files even the corrupted or the orphaned one.

Impersonate Export

Provides multiple OST to Office 365 migration to the Office 365 mailbox with Impersonation rights without the need of the Password.

Converts OST into PST

Capable of migrating the OST file into PST format. The software also has the option of splitting PST files if required.

No OST file limit

Transfers any small or large OST files, there is no any kind of restriction of the OST file size to use this tool.

No requirement of Outlook installation

The software does not require the Microsoft Outlook to be installed to the device to import OST to Office 365 Cloud Platform.


Can I export a single OST email to Exchange Online mailbox?

Yes, you can. The application has the features to export the selected OST emails or the OST folders to Office 365 mailbox.

Does it support the Hotmail OST files?

Yes, it supports the all Hotmail, IMAP, Exchange server, corrupted and the orphaned OST files.

Do I need to have the technical knowledge to use this software?

No, you do not require any kind of advanced technical knowledge as this tool is based on Graphical User Interface.

How many files can I import from the Demo version?

You can export the primary 20 data of each OST mailbox. If you want to migrate more OST data then you need to purchase the Full version.

Can I upload the only calendar using this tool?

Yes, you can transfer the only calendar also keeping all its attributes and attachments intact. It even does not disturb the scheduled meetings, appointments, etc.


I found this tool very easy to use with many features. It exported all my emails to Office 365 Archive mailbox keeping it in the original format.

— Bernadette, USA


This tool saved my lot of time providing the Bulk Export option which transferred multiple OST files at once.

— Kyle Nieples, USA


This tool has nice features. It’s the Export option to Office 365 Primary and Archive mailbox really helped me in managing the data to o365 mailboxes.

— Dmitry Glushchenko, Ukraine