How to migrate a large Archive mailbox to Office 365?

EdbMails Exchange migration tool can help you migrate oversized archive mailboxes from Exchange to Office 365. You can migrate mail data, user folders, public folders, contacts, calendars, permissions, mail header data, tasks, journals, notes from the source to the target with complete data consistency. You can migrate the archive mailbox to Office 365 archive mailbox or from archive to primary mailbox. The following steps detail the archive mailbox migration procedure by using EdbMails.

Large Archive mailbox to Office 365 migration

Planning a migration from Exchange archive mailbox to Office 365

Before you migrate from Exchange 2016 to Office 365 you must carefully plan the approach based on your current environment and migration requirements. Following is a checklist of items to identify and prepare your environments.

Ensure that the archive mailboxes you plan to migrate are in the on-premises Exchange server.
Determine whether you want to migrate the Archive mailboxes to Office 365 primary mailbox or Archive mailbox.
If you want to migrate the Archive mailbox directly to Office 365 Archive mailbox, you must enable the auto-expanding archiving feature on Office 365.
Remember that the auto-expanding works only on Office 365 and you cannot run it on the on-premises Exchange server.
See the list of auto-expanding archiving restrictions and consider the following points for all users.
If you would like to learn more about archiving, see how the auto-expanding archiving works
If your on-premises archive mailboxes are greater than the Exchange online auto-expanding limits, you can split them into PST files and migrate the PST to Office 365 using EdbMails Office 365 migration tool.
By default, the Archives have 100GB of storage when you enable them and the auto-expanding adds additional storage (unlimited archiving) when the threshold is reached. This limit is expandable upto 1.5TB per mailbox.
Unlimited archiving is a premium feature that requires Exchange online plan 2 or Exchange online archiving license.
Verify if your Exchange online mailbox license allows the archiving feature.

Pre Migration activities for Archive mailbox migration
- Step 1: Set the impersonation role on the source to the admin user
  Ensure that you set the ApplicationImpersonation permissions to the admin account on the source Exchange server.
- Step 2: Create mailboxes on the target Office 365 server
  Before you migrate to Office 365, ensure that you create mailboxes for users in your organization and assign suitable licenses to them.
  1. Add users and assign licenses to Office 365 users
  2. Assign Microsoft 365 licenses to user accounts
- Step 3: Enable the archive mailbox in Microsoft 365
  After you have created and assigned a license to a user mailbox, you must enable the archive mailbox in Office 365.
- Step 4: Set impersonation role to the admin user on the target
  Ensure that you have set the impersonation rights to the admin account on the target Office 365 server.
Migrate large Archive mailboxes Office 365
There are two methods to migrate large archive mailboxes to Microsoft 365 by using EdbMails
1. Direct migration of Archive mailboxes to Office 365
2. Import mailboxes by using the PST to Office 365 migration
Steps to migrate Archive mailboxes to Office 365
1. Step 1: Download and install EdbMails Exchange server migration software setup
  Download EdbMails and install the application on any computer that is connected to the source and target environment. You can also perform the migration operation by installing EdbMails on a non-Exchange server computer.
  Launch the application and click 'Login' or 'Start Your Free Trial'.
  Select the migration method as Live Exchange migration
  Refer to the link for a detailed list of EdbMails system requirements for Exchange migration.
  Note: If the Standard folders (such as Inbox, Calendar, Contacts) on your source Exchange server mailboxes are initialized with a different language, follow the below details to migrate these folders to the respective system folders on the target (destination) server.
  For Instance: If your source Inbox folder is named 'Boîte de réception', which is in French language and you migrate this folder directly to the destination server, then by default it will not be mapped to the 'Inbox' folder on the target server. In order to map the folder with the french name to the respective folder, change the regional settings on the target server to match that of your source mailbox folder language (in this case, it is French).
  Click here to know the steps to change the language and regional settings on Exchange server
2. Step 2: Connect to the Exchange server as Global Admin
  In the Connect to Exchange server (Source) window, select 'Connect using Global Admin User’. You can also load the mailboxes using a CSV file. Refer to the link for instructions on how to use the different Exchange server connection methods supported by EdbMails.
  See the steps to connect to archive mailboxes from EdbMails.
3. Step 3: Select the mailboxes and connect to Office 365
  Select the archive mailboxes from the Exchange that you wish to migrate to Office 365.
  Click 'Migrate to Office 365' to setup the connection with the target server
  
  If this is the first time you’re migrating with EdbMails, the migration is a full migration. On subsequent migrations from the same source to the target, the migration is incremental.
4. Step 4: Customize the Exchange to Office 365 migration operation
  EdbMails provides the following additional options to help you customize the migration task.
  Additional Include and Exclude Filter Options
  Filter emails by Date: Migrate to Exchange 2019 by applying the Date filter
  Filter emails by Size: Exclude emails from migration larger than a specified size.
5. Step 5: Connect to target Office 365 as Global Admin User
  EdbMails supports both modern and classic authentication. Connect to the target server by selecting Auto or Manual registration for modern authentication and the connection method as Archive Mailbox.
  Connect to Office 365 server using secure modern authentication
6. Step 6: Map the mailboxes between the source and the target
  The mapping activity in EdbMails can automatically match and map the mailboxes and folders between the Exchange server and Office 365. This activity saves time when you’re migrating a large number of mailboxes.
7. Step 7: Start the migration to Office 365 from Exchange 2013
  Start and monitor the migration operation after you complete the mailbox mapping. Finally, verify the count of migrated emails, folders and mailbox items with EdbMails text-based log report.
Migrate Archive mailboxes by importing PST into Office 365
EdbMails can also assist you in migrating to Office 365, if you have the archive mailboxes exported as PST files from your on-premises Exchange server, Download and run EdbMails if it hasn't already been installed on your system. The following steps outline how to migrate PST files from Exchange to Office 365.
1. Step 1: Select the migration method as Office 365 migration
  On the EdbMails migration selection popup, select the migration method as Office 365 migration.
2. Step 2: Add PST files in bulk to migrate to Office 365
  To add the PST files, close the Connect to Office 365 (Source) connection window and click migrate 'PST to Office 365' at the bottom.
3. Step 3: Connect to target Office 365 as Global Admin User
  EdbMails supports both modern and classic authentication. Connect to the target server by selecting Auto or Manual registration for modern authentication and the connection method as Archive Mailbox.
  Connect to Office 365 server using secure modern authentication
4. Step 4: Map and migrate mailboxes and folders to Office 365
  The mapping activity in EdbMails can automatically match and map the mailboxes and folders from the PST file to Office 365. This activity saves time when you’re migrating a large number of mailboxes. After you complete the migration, verify the count of the migrated items, folders and mailboxes with the help of EdbMails log report.
Archive mailbox migration troubleshooting
See the Archive migration troubleshooting guide for possible solutions related to migration errors. For more information on EdbMails Exchange migration refer to the frequently asked questions (FAQs)

Advantages of EdbMails for Exchange to Office 365 migration

Simple solution to migrate Exchange server to Office 365
If you plan to migrate to Office 365 on your own, there will be challenges and technical roadblocks. EdbMails removes the complexity and technicalities of Exchange and Office 365 migration and enables you to complete the mailbox transfer in a few clicks.
Incremental Exchange to Office 365 Migration
EdbMails supports incremental migration wherein it migrates the new and updated items avoiding duplicates on subsequent migrations to the same target mailbox. The incremental migration is valid for all Office 365 mailboxes, Public folder, Shared mailbox, and Archive mailboxes.
Single hop migration from Exchange to Office 365
EdbMails is a tailor-made solution to accomplish direct migration from Exchange 2007, 2010, 2013 to Office 365. Furthermore, it can also transfer mailboxes to Office 365 from Exchange 2019, 2016, Hosted and Live Exchange server. This eliminates the need for intermediate migration hops maintaining perfect data consistency on both the source and the target.
Batch or individual Exchange mailbox migration
EdbMails allows you to migrate a single Exchange mailbox or multiple mailboxes in batches. You can migrate folders, specific attachments, contacts and calendars from On-Premise or Hosted Exchange to Office 365.
Automatic handling of Office 365 throttling
EdbMails Exchange migration is a fully automated tool that is capable of automatically handling Office 365 throttling and connection interruption during the migration.
Facility to include and exclude email items and folders
During the Exchange 2013 migration to Office 365, you can use filter options in EdbMails settings to include or exclude mail items based on Date, Subject, Sender, and Recipient Address. You can also exclude emails and attachments if their size exceeds a specified limit.

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Large Archive mailbox to Microsoft 365 migration

Steps to migrate large Archive mailboxes to Office 365

Planning a migration from Exchange archive mailbox to Office 365

Pre Migration activities for Archive mailbox migration

Migrate large Archive mailboxes Office 365

Steps to migrate Archive mailboxes to Office 365

Migrate Archive mailboxes by importing PST into Office 365

Archive mailbox migration troubleshooting

Advantages of EdbMails for Exchange to Office 365 migration