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    • Exchange Server MigrationMigrate Exchange 2007, 2010, 2013, 2016, 2019 to Office 365 tenants. Also, migrate between Exchange servers and PST
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    • Office 365 BackupIncremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup
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User’s Manual
IMAP Email Backup & Migration

User Manual

User Manual

  • Overview
  • System Requirements
  • Installation
    • Installation process
    • Reinstall or Upgrade
    • How to uninstall
  • Initial Setup
  • FAQ
    • IMAP Migration to Office 365
    • IMAP Migration to Exchange
    • Gmail Backup and Migration
  • Videos
    • IMAP to Office 365 Migration
    • IMAP to Exchange Migration
    • Gmail Backup and Migration
    • IMAP Migration to PST
    • Outlook PST to IMAP Migration
    • IMAP Migration to IMAP
  • Screenshots
    • IMAP Migration to Office 365
    • IMAP Migration to Exchange
    • Gmail Backup and Migration
    • IMAP Migration to PST
  • How it works?
    • IMAP Migration to Office 365
    • IMAP Migration to Exchange
    • Gmail Migration
    • IMAP Migration to PST
    • IMAP Migration to IMAP
    • Outlook PST to IMAP
    • cPanel to cPanel Migration
    • IMAP to Office 365 Shared mailbox migration
  • Connect to IMAP
    • Connect IMAP Single Server
    • Connect IMAP Multiple Server
  • Enable less secure apps in Gmail
  • Export Gmail contacts and calendars
    • Export Gmail contacts to Office 365
    • Export Gmail Calendars to Office 365
  • Connect to Office 365
    • Modern Authentication Using OAuth 2.0
      • Microsoft 365 modern authentication
      • Automatic Registration
      • Manual Registration
    • Connect with Global Admin
    • Connect to Office 365 with full access permission
    • Connect to Office 365 with CSV file option
    • Connect to Office 365 as single user mailbox
  • Connect to Exchange server for multiple mailboxes migration
    • Connect with Global Admin
    • Connect to Multiple user using CSV file
    • Connect using full access permission
    • Connect individual users for Single / Specific user Migration
  • Connect to Hosted Exchange for its Migration
    • Connect with Full Access permissions
    • Using multiple user credentials with CSV file
    • Connecting to Individual user for its migration
  • Knowledge Base
    • IceWarp to Office 365 migration
    • Zimbra to Office 365 migration
    • AOL Emails to Office 365 migration
    • Zoho Mail to Office 365 migration
    • GoDaddy to Microsoft 365 migration
    • ProtonMail to Office 365 migration
    • cPanel to Office 365 migration
    • Rackspace to Office 365 migration
    • Plesk to Office 365 migration
    • Barracuda to Office 365 migration
    • AWS Workmail to Office 365 migration
    • 123 Reg to Office 365 migration
    • Bluehost to Office 365 migration
    • 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
    • Mimecast Archive to Office 365 migration
    • HostMonster to Office 365 migration
    • SiteGround to Office 365 migration
    • Fastmail to Office 365 migration
    • SmarterMail to Office 365 migration
    • MDaemon to Office 365 migration
    • Zimbra to Gmail migration
    • Rackspace to Gmail migration
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    • Rackspace to AWS migration
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    • GMX Mail to Office 365 migration
    • Gmail to Tutanota migration
    • Ionos to Office 365 migration
    • Hostgator email to Office 365 migration
    • Namecheap email to Office 365 migration
    • Posteo to Office 365 migration
    • Tiscali email to Office 365 migration
    • Tiscali email to Gmail migration
    • BT email to Office 365 migration
    • Open xchange email to Office 365 migration
    • Cox email to Office 365 migration
    • BigPond email to Office 365 migration
    • ATT email to Office 365 migration
    • Frontier email to Office 365 migration
    • Charter email to Office 365 migration
    • Horde email to Office 365 migration
    • T-online email to Office 365 migration
    • Virginmedia email to Gmail migration
    • Earthlink email to Gmail migration
  • Set Office 365 Impersonation rights
    • Using PowerShell commands
    • Using Office 365 GUI
  • Set Exchange Server Impersonation rights
    • Exchange 2007 and below
    • Exchange 2010, 2013, 2016 and 2019
    • Set using Exchange Server GUI
  • Incremental Migration
  • Exchange Throttling Policy
  • Map the Mailboxes
  • Multifactor Authentication
    • Enable MFA in Office 365
    • Create App password for MFA
    • Disable Security Defaults
  1. Home
  2. Product
  3. How to Migrate from FastMail to Microsoft 365 (Office 365)
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Fastmail to Office 365 migration

Fastmail, an Australian-based email hosting provider, is known for its strong focus on privacy, prioritizing data protection over advertising and tracking. It offers custom domain email addresses and up to 600 aliases through plans like Basic, Standard, and Professional. While Fastmail shares some similarities with Microsoft 365 (Office 365) - especially in terms of privacy, licensing, and email archiving—it lacks many advanced features essential for growing businesses.

For instance, Fastmail’s Basic plan offers just 2 GB of storage per user, which is insufficient for businesses with large data needs. Additionally, Fastmail primarily provides email, calendars, and contacts, but it lacks integrated productivity tools such as cloud storage or business applications. In contrast, Office 365 is a comprehensive productivity suite, offering not only email but also tools like Microsoft Teams, OneDrive, and the Office suite.

Office 365 stands out with its enhanced security features, including Exchange Online Protection, Advanced Threat Protection, and Microsoft Defender for Business, which Fastmail does not provide. The superior app integration and collaboration tools within Office 365 make it a more powerful solution for businesses looking to scale and enhance productivity.

FastMail to Office 365 migration

Migrating from Fastmail to Office 365 can be challenging due to differences in storage, features, and integrations. Fastmail’s limited storage and lack of apps like OneDrive or Teams require careful planning during migration. Businesses also face issues like data mapping inconsistencies and downtime, which must be addressed for a smooth transition to Office 365.

EdbMails IMAP migration software offers a solution to these challenges by providing a seamless, efficient migration process from Fastmail to Office 365. With features such as advanced filtering options, EdbMails ensures that only the necessary data is migrated, eliminating any clutter and simplifying the process. The tool also utilizes AES 256-bit military-grade encryption , ensuring that data remains secure throughout the migration. Automated mailbox mapping minimizes the need for manual intervention, reducing the risk of human error, while EdbMails’ 24/7 free tech support ensures that businesses can receive timely assistance if any issues arise.

User Query

“We currently use Fastmail's standard email plan and would like to switch to Microsoft's Office 365. We would like to continue receiving emails on our previous domain after the migration without disrupting the current setup. Could someone please point us in the right direction? Thank you very much.”

  1. Fastmail email to Office 365 migration plan

    Planning is one of the most important steps before you begin the Fastmail email to Office 365 migration. Here is a checklist of points to consider before you migrate.

    • Determine the size of the data and the number of mailboxes you want to migrate.
    • Make a list of all the data and permissions from Fastmail email that you want to transfer.
    • Create appropriate user mailboxes on Office 365 and assign licenses to them.
    • Ensure you have enough network capacity and bandwidth to migrate.
    • Communicate the migration plan and flow to your end users.
  2. Fastmail email to Microsoft 365: Pre-migration activities

      1. Have the users email address, passwords, IMAP hostname and port number.
      2. Find the IMAP server name of your Fastmail email server. You can find this information from your server’s dashboard settings or by connecting your email system to Outlook.
      3. Before you migrate Fastmail email to Office 365, ensure that you create mailboxes for your users in your organization and assign suitable licenses to them.

         Add users and assign licenses to Office 365 users

         Assign Microsoft 365 licenses to user accounts

      4. If you have a custom email domain from your hosting provider to which you want to migrate and receive emails, 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.

      5. Configure Office 365 to send and receive large messages.

         Follow the steps to increase the message size on Office 365 to 150MB and see tips to optimize IMAP migration to Exchange online.

  3. Steps to migrate from Fastmail to Office 365 using EdbMails

    • Step 1: Download and Install EdbMails software

      • Download and install the EdbMails application on your computer running on Windows OS.

         Know more details on EdbMails system requirements for IMAP migration.

        EdbMails software installation

      • Launch the application and click 'Login' or 'Start Your Free Trial'.

        EdbMails software login

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

        Select ‘IMAP to Migration’ option

      • Select ‘IMAP to Office 365 Migration’.

        Select ‘IMAP to Office 365 Migration’ option

      • Use the default job name provided by EdbMails, or click ‘New Job’ to create a custom name for easier identification and better management of multiple migration tasks.

        IMAP Job Name’ option

    • Step 2: Connect to source Fastmail server

      • To migrate a single user, enter the ProtonMail IMAP Host Name, Port Number (993 for SSL), and the user’s login credentials to establish a secure connection.

        Connection method

      • Choose the correct IMAP host name from the list or manually enter it (e.g., mail.yourdomain.com). Then, fill your email address, password.
      • Click the ‘Login’ button.

        Connect to single user account

      • For migrating multiple AOL mailboxes, select ‘Multiple (Bulk) Users/Accounts Migration’ and click ‘Next’.

        Connect to multiple user

      • Click ‘Download Sample CSV File’.

        download sample csv file

      • Update the CSV file by entering the necessary details such as the email address, password, server hostname, and port number. Once updated, save the file to apply the changes.

        modify csv file

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

        browse CSV file

    • Step 3: Select source Fastmail server mailboxes

      • Select the mailboxes or specific folders you want to migrate, then click ‘Next’ to proceed with the migration process.

        Click Add New Connection

    • Step 4: Connect to target Office 365 server

      • Click the ‘Add New Connection’ button to establish a new connection to the target Office 365. To use the previous connection, select it from the connection list and click the ‘Connect to Existing’ button to proceed.

        Click Add New Connection

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

        Select the required connection option

      • Select the authentication method and click the ‘Login’ button to continue.

        Connect to the target Office 365 server

      • Sign in through the official Microsoft login page to authenticate your account and proceed with the migration.

        Microsoft sign-in page

      • EdbMails allows you to load mailboxes automatically, which is quick and convenient. However, due to Microsoft API limitations, the automatic method can list up to 100 mailboxes at a time. For larger environments or to include specific mailboxes beyond this limit, you can use the CSV file method to load mailboxes manually—giving you full control over the selection process.
      • Click the ‘Next’ button to continue.

        Select the option to load the mailboxes

    • Step 5: Fastmail to Office 365 mailboxes mapping

      • Choose the appropriate mailbox and folder mapping option based on your migration preferences.

        Choose mailbox mapping option

      • You can choose to let EdbMails automatically create mailboxes in Office 365 and map them between the source and target servers. This feature is especially useful for large-scale migrations, saving time, reducing manual effort.

        IMAP server to Office 365 mailboxes mapping

    • Step 6: Start Fastmail to Office 365 migration

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

        Start IMAP server to Office 365 migration

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

        Start HostMonster to Office 365 migration progress

      • Login to your target server and verify the items.
  4. Fastmail to Office 365 post-migration tasks

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

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

  5. Fastmail to Office 365 migration troubleshooting

     For troubleshooting, visit Knowledge Base.

     For more queries, check Frequently Asked Questions or contact support.

Benefits of EdbMails to migrate from Fastmail to Office 365

  1. Selective email migration with date filters

    EdbMails offers a highly flexible migration solution that enables users to selectively migrate emails within a specific date range. This approach ensures that only relevant emails are transferred, optimizing the process while maintaining data integrity and avoiding the migration of unnecessary data.

  2. Bulk migration with data integrity

    EdbMails streamlines the migration from Fastmail to Office 365, supporting bulk migration of mailboxes with concurrent migration capabilities. This feature allows multiple mailboxes to be migrated simultaneously, speeding up the process. The tool ensures that all your data remains intact throughout the entire migration, eliminating the risks of data corruption or loss, even when migrating large volumes of information.

  3. Mailbox preview and folder selection

    The software offers a detailed preview of your Fastmail mailboxes, including all folders and subfolders, giving you complete visibility before starting the migration to Office 365. You can selectively choose specific folders for migration, ensuring that only the necessary data is transferred to Office 365, thus enhancing the efficiency of the entire process.

  4. Compatibility with all Windows OS versions

    EdbMails operates seamlessly across all Windows operating systems, offering broad compatibility and flexibility. Whether you are using Windows 10, 8, or older versions, the tool delivers consistent and reliable performance, making it an ideal choice for businesses of all sizes.

  5. Delta (incremental) migration

    EdbMails' delta migration feature ensures that any new or modified items, which were not migrated in the previous operation, are transferred to Office 365. This incremental process minimizes time and bandwidth usage by efficiently syncing only the new emails or changes, ensuring a seamless migration with no disruption.


Additional resources

  • Plesk to Office 365 migration
  • Barracuda to Office 365 migration
  • AWS Workmail to Office 365 migration
  • 123 Reg to Office 365 migration
  • IceWarp to Office 365 migration
  • Zimbra to Office 365 migration
  • AOL Emails to Office 365 migration
  • Remove duplicate emails in Fastmail
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 In this manual

IntroductionMigration PlanPre-Migration ActivitiesMigration StepsPost-Migration TasksTroubleshootingEdbMails Benefits

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