Migrate email hosting to Office 365: Move Email Hosting Easily

Manual Methods

These manual migration methods cover common ways to move email data to Microsoft 365, with the appropriate method depending on the source system, mailbox size, and number of users. 

1. IMAP Migration

If the current email hosting provider supports IMAP, you can migrate IMAP Email to Office 365. This is commonly applicable to hosted email services and other IMAP-enabled mail systems.

The basic overview of the process is:

1. Create the users and Microsoft 365 mailboxes. Each user must have a target Microsoft 365 mailbox before the migration starts.
2. Identify and prepare the source IMAP server. Collect the IMAP server name and required connection settings.
3. Collect the source mailbox credentials: You need the username and password for each mailbox, or supported administrator credentials that can access the mailboxes.
4. Create a CSV file containing the Microsoft 365 email address, source username, and source mailbox password or supported credentials.
5. Create an IMAP migration endpoint in the Exchange admin center and enter the source IMAP server details.
6. Create and start the IMAP migration batch in the Exchange admin center using the endpoint and CSV file. Monitor the migration status and reports.
7. Change the domain’s MX record to Microsoft 365 after the migration is complete. This routes new incoming email to the Microsoft 365 mailboxes. Microsoft recommends verifying mail routing before stopping synchronization and deleting the migration batch.

Important: IMAP migration is for email messages and mail folders only. Microsoft states that contacts, calendar items, and tasks aren’t migrated through IMAP.

2. PST Export and Import

You know, if the existing email service can export mailboxes to PST files, you can migrate IMAP Email Hosting to Microsoft 365 by importing the data through PST files instead of connecting Microsoft 365 directly to the old mail server.

For organizations with multiple or large PST files, Microsoft provides two PST import options:

• Network upload: Upload PST files to Microsoft 365 using Microsoft’s Import service and AzCopy, create a mapping file, and start the import process.
• Drive shipping: Copy PST files to a hard drive and physically ship the drive to Microsoft for import.

This method is beneficial when the previous hosting provider lacks a proper direct migration connection. Check this blog if you want efficient ways to backup IMAP to PST.

3. Manual Outlook/PST Migration

Suitable for individual users or a small number of mailboxes. Users can export their emails, contacts, and calendar data from Outlook to a PST file, then import the PST into their Microsoft 365 mailbox. Microsoft also provides administrator options for bulk-importing multiple PST files when handling larger migrations. 

Migrate IMAP Email to Office 365 Manual Limitations

• Limited data types with IMAP: IMAP migration transfers email messages and mail folders but does not migrate contacts, calendars, or tasks.
• IMAP mailbox limits: IMAP migration supports a maximum of 500,000 items per mailbox, and individual messages larger than 35 MB cannot be migrated.
• Mailbox preparation: Microsoft 365 mailboxes must be created before starting an IMAP migration because the migration process does not create them automatically.
• Source mailbox access: Administrators need access to the source mailboxes through user credentials or supported administrator credentials.
• PST size recommendation: Microsoft recommends keeping individual PST files at 20 GB or smaller for better import performance.
• PST item size limit: PST import skips individual mailbox items larger than 150 MB.
• PST folder hierarchy limit: A PST containing 300 or more levels of nested folders cannot be imported.
• Additional PST preparation: Bulk PST imports require the Microsoft 365 Import service, mapping files, appropriate permissions, and AzCopy when using network upload.
• Corrupted data: Corrupted items within PST files may be skipped during the import process. Check this to Recover Deleted Emails from a PST File securely.

Professional Tool to Migrate Email Hosting to Office 365

The MailConverterTools Email Migration Tool provides a straightforward interface for moving email data between supported platforms. It supports different source categories, that are PST/OST, IMAP/POP3, Microsoft 365, GoDaddy (Office-based), and Hotmail/Outlook. Authenticate using IMAP options at the source to migrate to an Office 365 destination. Users can also apply filters such as Date Range, Item Type, Migration Rules, and Attachments. Active Tasks and All Reports allow IT teams to monitor ongoing tasks, review migration details, and access completed reports when needed. Explore the other migration options, including IMAP to Google Workspace, PST to IMAP, and more.

Software Steps

These are the basic steps to back up or migrate IMAP Email Hosting to Microsoft 365.

1. Launch the tool, choose Source, and authenticate the mailbox using the credentials required for the IMAP source.
2. After authentication, expand the folder tree to view email counts while retaining the original folders and subfolders. Select the data required for migration or backup.
3. Select Microsoft 365 as the destination, then apply Date Range, Duplicate Removal, Attachment Handling, and Folder Mapping according to your requirements.
4. Start the migration and monitor progress through the live dashboard. After completion, open All Reports to review transferred and skipped items and identify anything requiring another pass.

Scenarios Where the Professional Helps Companies

This tool helps in the following scenarios, which are used to migrate IMAP Email Hosting to Microsoft 365.

Moving from a Third-Party Email Host Organizations can migrate from email providers like GoDaddy, cPanel, Hostinger, and other hosted email services to Microsoft 365. Migration helps move the existing mailbox data while the company changes its email hosting to Exchange Online.

Replacing an On-Premises Email Server Businesses running email on an on-premises Exchange or other local server may move their mailboxes to Microsoft 365. This can reduce dependence on maintaining local email infrastructure while moving existing mailbox data to the cloud.

Consolidating Business Email Accounts Companies managing their email across different hosting services may move their accounts to Microsoft 365 under a centralized environment. This is useful during business expansion, restructuring, or when multiple email systems need to be brought under one setup.

 

Best Practices

Before beginning the process, it’s important to take a few preparatory steps to keep the migration under control and reduce unnecessary mistakes when the migration process starts.

• Verify the source: Source mailbox credentials and authentication details should be valid before starting the migrate email hosting to Office 365 process.
• Prepare destination: Make sure the required Microsoft 365 mailboxes are created, licensed, and ready to receive the data.
• Use CSV for bulk migrations: For multiple accounts, prepare and import a CSV file with the required source and destination details to reduce manual account entry.
• Select required data: Review the folder structure and email counts before migration, then select the folders or mailbox data to be transferred.
• Apply appropriate filters: Use Date Range, Item Type, Duplicate Removal, Attachment Handling, and Folder Mapping when required. This can help control data during the migration.
• Run a test migration: Start with a small number of mailboxes or selected folders. Review the results before processing the actual data.
• Monitor Active Tasks: Use the Active Tasks section to track running migrations and identify tasks that need attention.
• Review All Reports: Check All Reports for transferred, skipped, or failed items. Use these results to identify any data that needs to be migrated again.
• Keep the source available: Be sure that you will not close or cancel the old email hosting service until the process of migration is confirmed and the needed data is moved.

Conclusion

Moving mailboxes is more than just moving emails. Prepare the Microsoft 365 mailboxes, connect to the source email system, migrate the supported data, verify the results, and then route incoming mail through Microsoft 365. For IMAP-based hosting, Microsoft supports batch migration and recommends verifying the migration before changing the MX record and retiring the old service. For organizations moving multiple mailboxes or handling different source platforms, professional email migration software can reduce the manual work involved in authentication, data selection, filtering, migration monitoring, and reporting to migrate email hosting to Office 365.

Frequently Asked Questions

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