OST to Office 365 migration

Before you import OST to Office 365, prepare the target Office 365 server as described in the following section.

• Ensure 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.
• Prepare your target Office 365 tenant. See tenant roadmap for Microsoft 365.
• Purchase an Office 365 licensing plan specific to your needs. You can also sign up for a 30 day free trial and decide to go with a suitable one later. Compare Office 365 business plans and Compare Office 365 enterprise plans
• Create mailboxes for your users in your organization and assign suitable licenses to them.

   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

• If you plan to import Public folders from the 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

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

   See steps to add a custom domain to Office 365 and 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 and install EdbMails software

    • Download and install the EdbMails application on your computer by following the on-screen instructions.
    • Launch the application and click ‘Login’ or ‘Start Your Free Trial’.

       See a detailed list of EdbMails system requirements, for OST recovery, conversion, and migration.

      

    • Select the migration option as ‘OST to PST, OST to Office 365 and OST to Exchange’.

      

  • Step 2: Select the offline OST files

    • Browse and select the OST file from your computer that you want to import to Office 365.

        Tip: EdbMails repairs corrupted, orphaned, or inaccessible Outlook OST files. It allows you to directly migrate mail items from the OST file to Office 365 without needing the original Exchange server profile configured in Outlook.

      

  • Step 3: Select the mailboxes

    • EdbMails first performs a recovery operation and fully restores the OST file in case it is corrupted. You can preview the mail items such as emails, contacts, folders, notes, tasks, and calendars from the application’s preview pane. It is also a handy tool if you are looking to open an OST file without Outlook.
    • Select the required mailboxes/folders and click the ‘Migrate to Office 365’ button to continue.

      

  • Step 4: Connect to the target Office 365 server

    • Select your preferred method for secure OAuth-based modern authentication. The default option, Auto Registration, necessitates Global admin access. Alternatively, the Manual Registration method allows the use of either a Global admin account or any user account with full administrative privileges.

      

    • Next, select the desired migration option and proceed with the log in on the Microsoft sign-in page.

      

       After logging in successfully, choose one of the options to load the mailboxes from the target Office 365 server. You can also load mailboxes using a CSV file.

      

  • Step 5: Map source and target server mailboxes

    • Select the required mailbox mapping option

      

        You can choose the option to allow EdbMails to automatically create mailboxes in the target Office 365 and map the source mailboxes to the target mailboxes.

      

    • Click the ‘Folder and Item Filter’ button to set a filter for your migration. For instance, you can choose to migrate data only within a specific date range by applying a date filter. Additionally, you can exclude both standard and custom folders from the migration.

      

  • Step 6: Start OST to Office 365 migration

    • Once the mailboxes are mapped, provide a job name and begin the migration. To view the detailed migration report, click the ‘View Log’ button, which provides the complete migration process status, including the number of emails, folders, and mailbox items successfully migrated.

      

• 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.