Migrate OST to Office 365

To import OST to Office 365, first, prepare the Office 365 server for OST import as mentioned in the following section.

• Make sure that you meet the network and bandwidth requirements for the migration. See network and migration planning, performance factors and best practices for Office 365 migration.
• Get your target Office 365 tenant ready. See the Microsoft 365 tenant roadmap.
• Select an Office 365 licensing plan that meets your needs. You can also sign up for a 30-day free trial and then decide which plan suits you best. Compare the Office 365 business plans and Office 365 enterprise plans so you can make an informed decision about which is best for your organization.
• Create mailboxes for your organization’s users and assign the appropriate licenses.

   Add users and assign licenses to Office 365 users

   Add several users at the same time to Office 365

   Assign Microsoft 365 licenses to user accounts

• In case you want to import a Public folder from an OST file into Office 365, ensure that you create and configure the Public folder mailboxes on the target server.

   Create Office 365 Public folder and assign mailbox user

• To migrate In-Place archives to Office 365, enable the archive mailbox on the target server. See how to enable online archive in Office 365
• If you want to receive emails from the source to a custom email domain, you need to add and verify the custom domain on Office 365 after migration.

    Follow the steps to add a custom domain to Office 365 and the steps to add DNS records to connect your domain.

• Configure Office 365 to send and receive large messages

   Follow the steps to increase the message size on Office 365 to 150MB.

• • Step 1: Download EdbMails OST to Office 365 Migration Tool

    • Download and install the EdbMails application on your computer.

      

    • See a detailed list of EdbMails system requirements for OST file conversion
    • Launch the EdbMails application.
    • Sign in using your email address and password, then click ‘Login’. If you’re new to EdbMails, simply select ‘Start Your Free Trial’ to continue with the trial version.
       Note: The Free Trial version allows you to explore all features and migrate up to 30 items from each and every folder. To migrate all the items, a license is required.

       Click here to purchase the license from the EdbMails website.

      Once your purchase is complete, close and reopen the EdbMails application, then log in again using the same email address and password used during license purchase. Your license will be activated automatically.

      

    • Select ‘OST Recovery and Migration’

      

    • Select ‘OST to Office 365’.

      

    • You can continue with the default job name or select the ‘New Job’ button if you prefer to change the job name.

      

  • Step 2: Select the offline OST files

    • Click ‘Browse for OST file'.

      

    • Select the offline OST file from your local drive, then click the ‘Next’ button to continue. You can also share the OST file on a network with read and write permissions enabled.

      

  • Step 3: Preview and select the mailbox

    • EdbMails thoroughly scans the offline OST file and restores mailbox data even in cases of damage or corruption. The software evaluates the internal structure of the OST and retrieves emails and other mailbox items. The duration of this process varies based on the file’s size and the extent of corruption. Allow the scan to finish completely to ensure accurate and comprehensive recovery of your data.

      

    • Once the recovery process completes, EdbMails presents the restored OST mailbox in its full folder and subfolder structure within the main interface. You can easily navigate through any folder or subfolder to view its data. Selecting a specific category, such as Emails, Contacts, Notes, Tasks, or Calendar, displays all corresponding items, along with a detailed preview of the highlighted content on the right pane. EdbMails OST to PST Converter allows you to open an OST file without Outlook.
    • Select the entire OST file or the required folders / subfolders and click the ‘Next’ button.

      

      EdbMails flexible filtering options that help to customize your export process. For instance, you can apply date-based filters to export only the items that fall within a specific time range. To configure this, navigate to the ‘General’ section on the left pane and then open the ‘Settings’ tab located at the top-right corner.

      Click here to learn more about setting date filters for OST to PST conversion.

  • Step 4: Connect to the target Office 365 server

    • Click ‘Add New Connection’ to create a new connection to the target Office 365 server. To reuse an earlier configuration, select it from the connection list and click the ‘Connect to Existing’ button to continue.

      

    • Select the required connection options and click the ‘Next’ button.

      

    • Choose your preferred authentication method and then click ‘Login’ to proceed.

        Connect to Office 365 server using secure modern authentication

      

    • Authenticate on Microsoft sign-in page.

      

    • Select one of the methods to load the mailboxes. You can also load the mailboxes using a CSV file.

      

  • Step 5: Map source and target mailboxes

    • Choose the required mailbox mapping option

      

    • EdbMails automatically creates mailboxes on your target Office 365 server and assigns the necessary licenses.

       Learn more about the automatic mailbox creation process on the target Office 365 server.

    • By default, EdbMails performs automatic mailbox and folder mapping between the source and target servers, ensuring a smooth and consistent migration experience. You can also manually map individual source mailboxes to their corresponding target mailboxes, enabling precise alignment based on your organizational or user-specific requirements.

      

  • Step 6: Start OST to Office 365 migration

    • Click the 'Start Migration’ button to initiate the migration process.

      

    • The migration process is in progress, and you can monitor it in the progress bar. You also have the option to pause or resume the operation at any time. Once the migration operation is completed, EdbMails will display a confirmation message.

      

    • You can verify the list of migrated folders and mailbox items with EdbMails text-based migration log report.
    • Login to your target Office 365 server and verify the migrated items.

• Step 1: Update the MX records to point to Office 365

  Update the MX records to direct incoming emails to the target Office 365 server, ensuring email delivery. Additionally, set up the Autodiscover record to enable Outlook to automatically connect to the newly migrated mailboxes.

• Step 2: Create a new Outlook profile for users in the new domain

  Configure the Outlook profile for each user in your domain if Outlook has problems connecting to Office 365 mailboxes.

For troubleshooting, visit our Knowledge Base. For more queries, refer to the Frequently Asked Questions or reach out to our support team.