WholeClear OST to Office 365 Converter
Upload Offline OST data to Office 365 cloud environment effortlessly

WholeClear OST to Office 365 Migration Tool support import Exchange Server OST files to Office 365 without using Outlook in the conversion process. The application exports all emails, contacts, notes, tasks, journals, calendars, etc. from OST to O365 cloud. The utility supports all Outlook editions and easily upload every size Outlook OST file.



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OST 2 Office 365 Converter to export OST file to O365

  • Uncomplicated and speedy conversion of OST emails to Office 365 with attachments
  • Complete conversion of OST messages, contacts, calendars, etc. to Office 365 account
  • Maintain the folder hierarchy & HTML, RTF formatting
  • Migration of selected folders or items from Outlook OST to Office 365
  • Allow large size OST files migration without any hurdles
  • Supportive to all MS Outlook versions
  • Work without MS Outlook and Exchange Server connection
  • Capability to run on all Windows operating systems
  • Complete preview and scanning feature available
  • Secure and error-free conversion results all the time
  • Upload OST files to any folder of Office 365 account
  • Free OST to O365 Migration Tool to check the suitability of the application
  • Live Chat Support facility is available to assist users

Find features of OST to O365 Migration Tool

Benefits of the tool to export OST to cloud based Office 365 mailbox

OST to Office 365 conversion

WholeClear OST 2 Office 365 Migration Tool comes with an option to export the complete database of OST file which includes all email messages, contacts, notes, calendars, tasks, etc. while you upload offline OST file to Office 365 cloud. Without any extra efforts, users can perform the complete conversion undoubtedly.

Preview OST file completely

The application is defined to generate a complete view of OST file earlier its conversion to Office 365 account. By this, users can check all the database and ensure its accuracy. The tool scans the OST file completely so there are no chances of errors. With the preview, users can get an idea of how these files appear in Office 365.

Permit large & selected OST

Every large size Outlook OST file is permissible to migrate into Office 365 with this application. Even users can export the selected database as per their requirements. The tool does not generate any errors due to the size of OST file and performs the selected data migration in a seamless manner. The utility completely works as per users’ requirements.

Maintaining Hierarchy

The application is renowned to maintain the security of the database. It completely retains the structure of folders and subfolders meanwhile and after the conversion. Moreover, the email components like to, cc, bcc, subject, from, etc. along with email formatting like font style, hyperlinks, images all are safely moved from OST 2 Office 365 account.

Windows Compatible Tool

Users can import Exchange Server OST files to Office 365 on all Windows operating systems without any hurdles. All editions of Windows including Windows 10, 8.1, 8, 7, XP, Vista, and others are well supported. The tool works seamlessly on 32-bit and 64-bit versions of Windows OS without interrupting other tasks on the system.

Work without Outlook

The OST to O365 Converter application works independently without Outlook installation and connection to Exchange Server. One can seamlessly export OST files to Office 365 account without any issues. Additionally, with the simplified interface, understanding the utility becomes so simple for users for every beginner user.

Hassle-free migration

Enjoy hassle-free upload Offline OST data to Office 365 cloud with WholeClear OST to Office 365 Converter application. The application provides 100% error-free conversion results without any damage. There will be no damage to the quality of emails and related attachments during the migration of OST emails to Office 365.

Demo available for testing

The software is available both in demo and license edition. The demo version is available for all users to assess the performance of the application. Once users feel satisfied with the application, they can move for the license edition and the license keys are sent immediately to users via email. The users can convert only 25 emails with the free version.

Frequent Questions Asked by Users


There are only a few steps to export OST file to O365 account –

  • Step 1. Run the application on your system
  • Step 2. Add OST files using the Browse button from the system
  • Step 3. Enter the login details of Office 365 account
  • Step 4. Specify a folder or create a new folder in Office 365 account
  • Step 5. Click on Upload Now button to commence the migration task
Yes, all Windows editions are supported by the application including Windows 10, 8.1, 8, 7, XP, Vista, etc. The tool does not create any trouble in working on various Windows platforms and does not disturb other tasks running on the system.
No, users are totally free to export any large size OST file to Office 365 account using this application. The utility does not restrict any big-sized OST files and allows its conversion without any hurdles. No matter how many emails it contains.
Yes, the tool is supportive to export OST file of Outlook 2019, 2016, 2013, 2010, 2007, 2003, etc. Without creating any problem with any version, the utility works with full accuracy and does not damage any file.
Yes, of course. The utility supports complete OST file or selected folders migration as per user requirements. Users can freely choose the required folders for migration and excludes the undesired folders as per their needs without putting any extra efforts.
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