Dovecot to Office 365 Migration

Dovecot is a capable IMAP/POP3 server, but organizations may move the email workload to Microsoft 365 when they want a managed Exchange Online environment and integration with Microsoft collaboration services.

1. Centralized cloud administration: Microsoft 365 provides tenant-level management for users, mailboxes, security policies, and service configuration.
2. Microsoft 365 integration: Exchange Online integrates with Outlook, Teams, OneDrive, SharePoint, and other Microsoft 365 applications.
3. Security and compliance options: Depending on the selected plan, Microsoft 365 provides capabilities such as multi-factor authentication, mail-flow protection, retention, encryption, and compliance controls.
4. Scalable mailbox management: Organizations can add users and choose Microsoft 365 or Exchange Online plans based on mailbox, archiving, security, and application requirements.
5. Custom-domain support: Existing business domains can be verified in Microsoft 365 and routed to Exchange Online after the migration is validated.

Before you actually start to migrate from Dovecot to Office 365, you need to have a proper plan and ensure that you are prepared for the migration. Here is a quick checklist of items for your convenience.

• Decide if you want to retain the same domain on Dovecot or change to another hosting provider.
• Decide if you want to migrate your data all at once or in stages.
• Create a CSV file with a complete list of mailboxes to be migrated along with the user credentials.
• Verify if the CSV file format and user credentials are correct.
• Remove any unused or unnecessary mailboxes from the source system to streamline the migration process.
• Notify end users and relevant stakeholders about the migration plan, ensuring they are informed of any upcoming changes.
• Select the appropriate Office 365 licensing plan and assign the relevant licenses to user mailboxes.
• Conduct a pilot migration and verify representative folders, messages, attachments, item counts, and target access before the production batch.

1. If you want to migrate multiple users from Dovecot, download the sample CSV file from the EdbMails IMAP login window Create a list of users in a CSV file, which you want to migrate from Dovecot.
2. Find the name of your source email server from an email client
3. Select a suitable Microsoft 365 or Exchange Online licensing plan based on mailbox, archiving, security, compliance, and application requirements. Compare Office 365 business plans and Compare Office 365 enterprise plans
4. Create Office 365 mailboxes and assign licenses to them
    Add users and assign licenses to Office 365 users
    Assign Microsoft 365 licenses to user accounts
5. If you plan to migrate your mailboxes to Office 365 Public folders, ensure that you create and configure the Public folder mailboxes on the target server.
    Steps to Create Office 365 Public folder and assign mailbox user.
6. Similarly, if you want to migrate mailboxes to Office 365 In-Place archive, enable them from the admin center.
    Steps to enable archive mailbox in Microsoft 365.
7. 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.
8. Configure Office 365 to send and receive large messages.
    Follow the steps to increase the message size on Office 365 to 150MB. See message size limits on Office 365 for more information.

• Step 1: Download and Install EdbMails migration software

  • To initiate the migration process, download and install the EdbMails application on your Windows system.

    

  • Launch the EdbMails application on your system.
  • Enter your registered email ID and password, then click ‘Login’. If you are using EdbMails for the first time, choose ‘Start Your Free Trial’ to proceed with the trial version.
     Note: The trial edition provides access to all key features and allows migrating up to 30 items per folder. To migrate all eligible items for licensed mailboxes, purchase the required IMAP Migration license from the official EdbMails website.

     Click here to know IMAP Migration Pricing Details.

    After completing the purchase, close the application and open it again. Sign in using the same email ID and password used during the license purchase to activate the license successfully.

    

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

    

  • Select ‘IMAP to Office 365 Migration’.

    

  • A default job name is automatically assigned to the task. If needed, click ‘New Job’ to change it and assign a custom name for easier identification and better management.

    

• Step 2: Connect to source Dovecot server

  • To migrate one Dovecot account, select ‘Single User / Account Migration’, then choose the appropriate connection method such as ‘Connect to IMAP Server’ or ‘Connect to POP3 Server’ based on your setup. Click ‘Next’ to continue with the process.

    

  • Obtain the Dovecot server connection details from the server administrator, control panel, or an already configured mail client. Dovecot hostnames, namespaces, listeners, and authentication settings are deployment-specific.
  • For a Dovecot deployment configured for IMAPS, use port 993 with TLS. Where the server is configured for STARTTLS, port 143 can be used with STARTTLS. Enter the source mailbox username and credential required by that deployment.
  • The Microsoft 365 target connection uses the current EdbMails OAuth-based modern-authentication workflow.
  • Click the ‘Login’ button to proceed.

    

  • To migrate multiple Dovecot mailboxes in a single process, choose ‘Multiple (Bulk) Users/Accounts Migration’, then select the appropriate option for connecting to source IMAP Server such as ‘Connect to IMAP Server’ or ‘Connect to POP3 Server’.
  • After selecting the method, click ‘Next’ to continue.

    

  • Click ‘IMAP Migration CSV File’. It will load the sample CSV file to your local drive.

    

  • Open the CSV file and enter the required details for each mailbox, such as the email address, password, IMAP server hostname, and port number.

    

  • Once you’ve entered and saved all the required details in the CSV file, close it to finalize the changes.
  • Then, click the 'Load Modified CSV File' button, open the CSV file and click ‘Next’ to proceed.

    

• Step 3: Select source Dovecot server mailboxes

  • Choose the mailboxes or specific folders you want to migrate according to your requirement.
  • After selecting the items, click ‘Next’ to continue with the migration process.

    

• Step 4: Connect to target Office 365 server

  • Select the ‘Add New Connection’ option to set up a new connection to the target Office 365 account.
  • If a connection has already been configured, just select it from the list and click ‘Connect to Existing’ to proceed.

    

  • EdbMails provides flexible migration options, allowing you to migrate primary mailboxes, archive mailboxes, and public folders as needed.
  • Choose the appropriate connection settings and click ‘Next’ to continue with the authentication process.

    

  • Choose the authentication method based on your requirement.
  • Complete the sign-in through the official Microsoft login page, where your credentials are securely verified using OAuth 2.0.
  • Click ‘Login’ to proceed.

    

  • Authenticate by signing in on the Microsoft sign-in page to continue.

    

  • EdbMails automatically loads mailboxes, making the setup process fast and convenient.
  • Because of Microsoft API limitations, the automatic option can display only up to 100 mailboxes at a time.
  • In larger environments or when you need to add specific additional mailboxes, you can choose the CSV file method.
  • Loading mailboxes through a CSV file allows manual selection and provides complete control over the process.
  • Click ‘Next’ to proceed.

    

• Step 5: Dovecot to Office 365 mailboxes mapping

  • Choose an option to map the source mailboxes and folders to their corresponding mailboxes and folders in the target Office 365 account.

    

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

    

• Step 6: Start Dovecot to Office 365 migration

  • Review the mailbox mapping and click the ‘Start Migration’ button to initiate the migration process.

    

  • Click the ‘View Logs’ button to access the detailed migration report, which includes mailbox mapping, migration summary, and item count for each migrated mailbox and folder.

    

• 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 and receive email messages on the target Office 365 server. In addition to this setup, 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.

  Explore the knowledge base articles for troubleshooting common issues. For more information on EdbMails IMAP migration, review the FAQs or contact our dedicated support team for assistance.