MailsDaddy OST to Office 365 Migration
A simple solution for migrating OST files to Office 365 mailbox. The Application uploads entire OST data including emails, attachments, contacts & calendar items, etc. to o365 Primary, In-Place Archive, or Shared Mailboxes. Effortlessly recover and convert OST to Exchange Online.
- Upload Emails, Attachments, Contacts, Calendars & Tasks etc. to o365.
- One click app to Convert & Move OST file to Office 365 cloud platform.
- Migrate selected emails/folders from OST file to Exchange Online.
- Show preview of OST file data & attachments prior importing to O365.
- OST to Office 365 migrator keeps folder hierarchy & HTML formatting.
- Compatible with all Windows OS like Windows 10, 8.1 , 7, Vista, & XP etc.
- Convert Exchange server, IMAP & Hotmail OST files to Office 365 OWA.
- Bulk Migration - Import OST files to Office 365 mailboxes at once.
Certified & Highly Reviewed By Leading Software Authorities
Award-Winning & Recommended by Independent Editors
Crozdesk Review - MailsDaddy OST to Office 365 Migration Tool
MailsDaddy products liked and appreciated by a lot of users. There is a review website site named Crozdesk that has provided a 4.2/5 rating to our products. After a deep analysis of the software, the review company has given a rating of 84/100 in the Email category, 83/100 on user satisfaction. It has also provided with users "Quality Choice Award 2020" for robust features and the flawless outcome. The software always gives quality results without damaging or harming any data.
Trustpilot Review - Awesome Solution to Import OST to Office 365
The Software of MailsDaddy has got good reviews on the Trustpilot review website. Around 74% of people have given an excellent rating for its outstanding performance. Our services and product have got an overall rating of 4.3/5. It is liked and rated by a large number of people all over the globe and has expressed their good reviews towards the MailsDaddy Software products.
Secure & Clean OST to Office 365 Migration Tool - AccurateReviews Review
AccurateReviews one of the decent review company has examined our products and after its usage they have provides a rating of 8.6/10 for its usability, speed, features, support, and pricing. The MailsDaddy software is good at all the above-mentioned points and promises to give a successful and quality result. The product has recommendable features and an affordable price. It is suitable for all small, mid, and large enterprises.
Features of the OST to Office 365 Migration
Enterprise-grade recovery and conversion, packed into a simple desktop app — no technical expertise or Exchange server required.
Add & Scan Outlook OST File
Insert the OST file using Open tab. After selecting OST file, the softrware prefectly fix all bugs of OST file and thatn add the OST file in application.
Previews OST File Data
The OST to Office 365 migration tool previews the entire content of the OST file along with the attachment. Click on a particular email to read/view its data.
Migrate OST to Office 365
Simple to use converter to import OST to Office 365 mailbox. Click on the Export button and Choose Office 365 option to upload OST file to Office 365.
Maintains Folder Hierarchy & OST properties
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. The software keeps the entire email properties like To, Cc, Bcc, Subject, From etc. & read unread status.
Import Multiple OST Files to Office 365 Accounts
OST to Office 365 Converter provides the Bulk Migration feature through which you can simply migrate multiple sigle or multple OST files to Office 365 one or more accounts at one go. Jusct create and selecte the CSV file containing OST file paths and O365 email IDs.
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.
Migrate to Archive Mailbox
If you do not want to convert OST to Office 365 mailbox primary 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.
Advance Date Range Filter
If you are working with an organization from a 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.
Create Log reports
You do not 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.
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.
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 require the setup of Exchange Server or Outlook to Move OST to Office 365 platform.
Eye-Catching Features of MailsDaddy OST to Office 365 Migration software
Supports All Types of OST files
The unique and useful features that make the application highly exceptional. The software supports all OST files to Exchange Online mailbox and never creates any issue. The tool gives a successful outcome for all types of OST data files.
- Compatible with Windows 11, 10, 8.1, 8, 7, and Windows Server (32/64-bit).
- Supports all Microsoft Outlook editions without requiring Outlook pre-installed.
- Independent standalone utility engineered for high enterprise stability.
Move OST to Office 365 Primary, Shared & Archive Mailbox
The conversion tool helps in migrating the OST file to any mailbox of Exchange Online account. It means users are free to choose destination mailbox where you want to transfer OST data.
- Direct cloud mailbox migration into Office 365 or Live Exchange Server.
- Zero downtime migration preserving full folder trees and meta properties.
- Supports primary mailboxes, archive mailboxes, and custom folder trees.
Different Required Data Migration Options
Using this OST to Office 365 migration tool users can successfully filter and convert some imrotant email database to Microsoft 365 account witohut hassle. It offers users to use different meta search options, like (To, from, Subject, etc.) to easily filter all required databases. Below options let the user to upload all or the selected OST folders to O365 account.
- Using this OST to Office 365 migration tool users can successfully filter and convert some imrotant email database to Microsoft 365 account witohut hassle.
- It offers users to use different meta search options, like (To, from, Subject, etc.) to easily filter all required databases.
- Below options let the user to upload all or the selected OST folders to O365 account.
Secure OST to Office 365 Conversion
The software provides 100% security to the OST data file; even before moving OST to O365 account the tool ask for valid credentials. As you click the final Export button, a pop-up dialog box appears asking for the login details before migrating OST data to Office 365 mailbox.
- The software provides 100% security to the OST data file; even before moving OST to O365 account the tool ask for valid credentials.
- As you click the final Export button, a pop-up dialog box appears asking for the login details before migrating OST data to Office 365 mailbox.
- Engineered specifically for optimal secure ost to office 365 conversion workflows.
We Migrate All Data OST to Office 365 (Exchange Online)
Every folder hierarchy, email header, embedded attachment, contact attribute, and calendar recurrence is processed with 100% bit-exact fidelity.
Email: The converter migrates the offline OST data file emails to...
Email: The converter migrates the offline OST data file emails to Office 365 account. Through this application, the user can even choose the naming conventions to search the OST emails such as:
Supported Elements & Formats:
Convert OST to OFFICE-365 in 5 Simple Steps
No technical skills needed. Watch each step in the live software interface or click any step below.
Looking for the complete user manual and working guide?
Explore comprehensive guides for standard PST conversion, search & filter migration, and Live Exchange Server export.
Understanding OST Files & Why Need Safe Migration
Understanding Cached Exchange Mode, reasons for offline file inaccessibility, and how conversion resolves corruption.
Resolving Common OST File Issues
Damaged, orphaned, or inaccessible OST files can prevent users from accessing crucial mailbox messages. MailsDaddy OST to Office 365 Migration repairs and extracts data from problematic files without modifying original contents.
Common Causes of OST Corruption
Mailbox files can become unreadable or unstable due to several unexpected environment factors:
Sudden Application Termination
Abrupt power cuts or crashes while writing to OST files can leave header indexes inconsistent.
Oversized Mailbox Files
Exceeding recommended mailbox capacity can lead to performance degradation and corruption.
Hardware or File System Failure
Bad sectors on the storage drive or network transfer drops can damage database sectors.
Typical OST Error Messages
If you encounter any errors while accessing your mailboxes, converting with MailsDaddy OST to Office 365 Migration resolves them immediately:
How OST to Office 365 Migration Resolves the Problem
By bypassing the native email client's corrupt cache and performing low-level binary reading, OST to Office 365 Migration extracts all healthy and orphaned items directly into clean OFFICE-365 files.
Technical Specifications
Engineered for lightweight footprint, standalone execution, and broad enterprise compatibility for MailsDaddy OST to Office 365 Migration.
System Requirements
Full support for Windows Server 2022, 2019, 2016, 2012, 2008 & 2003 (32/64-bit)
Platform Support
Office 365, Microsoft 365, Exchange Online
Supported Formats
OST (Healthy, Corrupted, Orphaned, Large Archives)
Retains 100% attachments, inline images, headers, and metadata
Preserves complete folder hierarchy, read/unread flags, and timestamps
100% Offline & Private
Zero cloud uploads or telemetry. Processing happens strictly within your local machine.
No Outlook Required
Completely standalone engine. Processes OST files without requiring host email clients.
No File Size Limits
Tested on massive 50GB, 100GB, and 500GB+ enterprise mailboxes with zero crash.
Full Windows Support
Native execution across Windows 11 down to Windows XP & all Windows Server editions.
Trusted by IT teams and professionals worldwide
Explore our client testimonials to see why users trust and recommend our solutions.
“I was looking for a solution to uploading OST to Office 365 cloud. But the problem is that I don't have any technical skills. I used this tool and I amazed as I have migrated my data with no hurdle.”
J Driven
“I have an OST file of around 8 GB and I was looking for a perfect solution that can migrate the data of this OST file with. Thanks a lot to this OST to Office 365 import tool that worked like a charm for me.”
Sorin
“Recently I need to migrate my OST file to Office 365 environment but unable to find a good solution for performing the same. Then I came to know about this tool and it has performed the migration of my OST file to Office 365 platform.”
Chris Luker
Need Help with OST to Office 365 Migration?
Our dedicated 24/7 technical team is available to assist you with any migration or recovery challenge.
The free demo version lets you preview all items and export up to 20 emails per folder.
Frequently Asked Questions
Find clear answers regarding the OST to Office 365 Migration conversion process, file compatibility, and recovery features.
Follow these steps to upload OST data into Office 365:
All your OST file data will be converted to your Office 365 mailbox in a few minutes.
Start migrating with OST to Office 365 Migration today.
Download the free trial and inspect your recovered mailbox in minutes.