Plesk to Office 365 Migration using EdbMails

Plesk is a widely used web hosting control panel that includes built-in email management and an easy interface for both Linux and Windows servers. It works well for basic hosting requirements, but as businesses expand, it may not meet growing demands for advanced collaboration and scalability.

Microsoft 365 (which includes Office 365 services such as Exchange Online) delivers a cloud-based environment that integrates tools such as Word, Excel, PowerPoint, SharePoint, and Teams, enabling better teamwork and streamlined business processes. Migrating Plesk-hosted email to Microsoft 365 moves the email workload from the hosting environment to Exchange Online. Plesk can continue to manage websites and other hosting services; this guide focuses specifically on migrating IMAP-accessible email data.

1. Why do users prefer EdbMails for Plesk to Office 365 migration?

   The EdbMails IMAP Migration Tool provides a guided Plesk-to-Microsoft 365 email migration workflow for supported IMAP-accessible mailboxes. It migrates supported messages, attachments, folders, and common message properties, with incremental follow-up runs, mailbox mapping, concurrent processing, filters, and migration reports. Review source-to-target mappings and representative target data before cutover. For destination-wide planning, use the main IMAP to Office 365 migration guide.

2. Why Businesses Choose Office 365 Over Plesk

   Organizations move from Plesk to Office 365 to benefit from a modern, secure, and collaborative platform. Key reasons include:

   1. Integrated productivity tools like Word, Excel, Teams, and SharePoint.
   2. Enhanced security with encryption, MFA, and threat protection.
   3. Scalable mailbox storage to support growing teams.
   4. Cloud accessibility from any device, ensuring flexibility and continuity.
   5. Automatic updates and maintenance, reducing IT overhead.
   6. Advanced collaboration features for real-time communication and file sharing.

3. Plesk to Office 365 Migration Planning

   Effective planning is essential for a seamless Plesk to Office 365 migration. A structured approach minimizes risks, prevents data loss, and ensures a smooth transition. Follow these key steps to prepare your source and target environments:

   • Define Migration Scope: Determine the number of mailboxes and email data in scope, including messages, attachments, folders, and supported message metadata. Contacts and calendars require a separate migration method because they are not transferred through IMAP.
   • Document Source Details: Record the Plesk-hosted email addresses, IMAP server settings, mailbox sizes, and authentication details needed for the migration.
   • Prepare Office 365 Environment: Set up user mailboxes, assign licenses, and verify domain settings in Office 365 for uninterrupted email delivery. Learn more at Microsoft’s guide to adding users and licenses.
   • Assess Network Capacity: Verify sufficient bandwidth and network stability to support large-scale data transfers without performance issues.
   • Conduct a Test Migration: Run a trial migration with a small set of mailboxes to validate the process and address potential challenges. Explore our for solutions to common issues.

4. Plesk to Office 365 migration prerequisites

   Follow the below pre-migration activities while migrating Plesk to Office 365

   1. Ensure that you have admin access Plesk and Office 365 accounts
      

      The admin account that has all the necessary permissions to migrate mailboxes on behalf of all the users in your organization. Ensure the account used for the Microsoft 365 target connection has the permissions required by the selected EdbMails OAuth-based connection method.

   2. Create Office 365 mailboxes and assign the licenses

       Click here to Add users and assign licenses to Office 365 users

       Assign Microsoft 365 licenses to user accounts

   3. To migrate Plesk mailboxes to Office 365 Public folders, ensure that you create a public folder and assign users to mailboxes on the Office 365 server.

       Create Office 365 Public folder and assign mailbox user

   4. If you are in plan to migrate mailboxes to Office 365 archive mailboxes, ensure to enable In-Place archive in Office 365 admin center.

       Steps to enable archive mailbox in Microsoft 365.

   5. If you have a custom email domain from the source which you want to retain and receive emails to, you must add and verify the domain on Office 365.

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

   6. Customize the message size limits for large size messages

       Follow the steps to increase the message size on Office 365 to 150MB. See message size limits on Office 365 for more information.

5. Steps to Migrate Plesk to Office 365

   • • Step 1: Download and install EdbMails IMAP migration application

       • Download EdbMails and install the application on any computer operating on Windows OS.

         

       • Open the EdbMails application on your system.
       • Enter your registered email address and password, then click ‘Login’. If you are a new user, select ‘Start Your Free Trial’ to continue with the trial version.
          Note: The trial version includes the major migration features and lets you migrate up to 30 items per folder. To remove the trial item limit, purchase a valid IMAP Migration license from the official EdbMails website.

          Purchase the license directly from the official website

         Once the purchase is complete, close and relaunch the application. Log in again with the same email address and password used for the purchase to activate the license successfully.

         

       • Select the option ‘IMAP (Gmail, Outlook & more) Migration’.

         

       • Select ‘IMAP to Office 365 Migration’.

         

       • Use the default job name or select 'New Job' to customize the name.

         

     • Step 2: Connect to source Plesk server

       • To connect a single Plesk account for migration, click ‘Single User / Account Migration’, choose the suitable connection option such as ‘Connect to IMAP Server’ or ‘Connect to POP3 Server’. Click ‘Next’ to proceed.

         

       • For a single-user login, enter the IMAP server hostname configured for the Plesk-hosted mailbox. Plesk deployments can use different mail-server hostnames and security settings, so verify the current connection details in the hosting control panel or with the server administrator.
       • Enter the mailbox email address and the credential required by that server.
       • Next, click the ‘Login’ button.

         

       • To migrate multiple Plesk mailboxes at once, select ‘Multiple (bulk) Users/Accounts Migration’, choose the suitable connection method such as ‘Connect to IMAP Server’ or ‘Connect to POP3 Server’.
       • Then proceed by clicking ‘Next’.

         

       • Select ‘IMAP Migration CSV File’ to download a pre-formatted template. Use this file to fill in the required mailbox information such as email addresses, server details, and login credentials to configure bulk migration.

         

       • Modify the CSV file with the required details such as email address, password, host name and port number in the CSV file and save the changes.

         

       • Once you've made the necessary changes to the CSV file, save and close it.
       • Then, click on the 'Load Modified CSV File' button, find your updated file, select it, and open it to continue.

         

     • Step 3: Select the mailboxes or folders to migrate

       • Choose one or more mailboxes or specific folders you wish to migrate.
       • Then click ‘Next’ to continue.

         

     • Step 4: Connect to target Office 365 server

       • Select the ‘Add New Connection’ option to establish a connection with your target Office 365 account.
       • If you have previously set up a connection, you can choose it from the available list and click ‘Connect to Existing’ to proceed.

         

       • With EdbMails, you can flexibly migrate primary mailboxes, archive mailboxes, and public folders smoothly using a single, unified solution.
       • Select the required connection settings and click ‘Next’ to proceed with the authentication process.

         

       • Choose your preferred secure authentication method for the target Office 365.
       • The login process takes place on the official Microsoft sign-in page, where your credentials are securely authenticated through OAuth 2.0, ensuring a safe and protected access experience.
       • Click the ‘Login’ button.

         

       • Authenticate on Microsoft sign-in page.

         

       • Once you sign in to your target Office 365 server, choose the preferred method to load the mailboxes
       • EdbMails loads mailboxes automatically to simplify the configuration process. Due to Microsoft API limitations, this option displays a maximum of 100 mailboxes at a time
       • For larger organizations or when selecting particular mailboxes, use the ‘Load Mailboxes using .CSV file’ option, which enables manual selection and gives you full control over the loading process
       • Click ‘Next’ to continue

         

     • Step 5: Plesk to Office 365 mailboxes mapping

       • Select the mapping option that best aligns with your requirements.

         

       • Where supported and selected, EdbMails can assist with target mailbox creation and mailbox mapping. Verify Microsoft 365 licensing and review every source-to-target mapping before starting the production migration.

         

     • Step 6: Start Plesk to Office 365 migration

       • After mapping the mailboxes, click the ‘Start Migration’ button to initiate the migration process.

         

       • Click the ‘View Log’ button to view the migration report, which includes mapping details and the total count of migrated emails.

         

       • Login to your target server and verify the migrated items.

6. Plesk to Office 365 post migration tasks

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

     If you have not done this step previously, change the DNS records known as MX records to enable email and receive messages on the target Office 365 server. In addition, configure the Autodiscover record to allow Outlook to connect to the 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.

7. Troubleshooting Guide for Plesk to Office 365 Migration

     For assistance with common migration issues, please refer to the troubleshooting guide. For more in-depth details on EdbMails IMAP migration, visit the Frequently Asked Questions(FAQs) section.

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Additional resources:

• IMAP to Office 365 migration
• EdbMails IMAP migration software
• Dovecot to Office 365 migration
• hMailServer to Office 365 migration
• BigRock to Office 365 migration
• Liquid web to Office 365 migration
• Dreamhost to Office 365 migration
• Comcast to Office 365 migration
• Google Vault to Office 365 migration
• Enterprise Vault to Office 365 migration