Migrate Exchange 2010 Linked Mailboxes to Office 365: An Ultimate Guide

Anuraag Singh | December 28th, 2018 | Updates

Are you stuck between the never-ending process while migrating Exchange 2010 linked mailboxes to Office 365? If your answer is Yes, then just go through this article once and relieve yourself from migration stress.

In this article, we are going to describe two workarounds that use different approaches to import linked mailbox from Exchange Server 2010 to Office 365 mailbox. After reading this post, certainly, all the problems of users related to the migration process will resolve.

Well, the goal of this article is to point you towards each and every information related to linked mailboxes. So we have considered everything, therefore, we start with a quick overview about Linked Mailboxes.

Idea Behind Exchange Linked Mailboxes

The concept of linked mailboxes comes into existence when user needs to connect Exchange Server with a resource forest or cross-forest migration. Actually, it gives the power to incorporate Exchange in an individual forest and allow to access the same mailbox. In fact, a trust must exist in-between the forest to generate a linked mailbox.

Creating a linked mailbox in Exchange is not a rocket science. For this, one can only need to follow the few steps that are mentioned below.

Steps to Create Linked Mailbox Via. Exchange Admin Center

The linked mailbox can be created by either using EAC or Exchange Management Shell. Here, we are using EAC because it is a more user-friendly way. Moreover, before starting the procedure, a user account should be available in the account forest

1. Open EAC and click on Recipients >> Mailboxes

2. After that, click on New and select Linked Mailbox

3. From the New linked mailbox page, you need to select the desired account forest name for which linked mailbox will create. Then, click Next.

4. In such a situation when the organization creates a one-way outgoing trust, a message prompts and asking for admin credentials in order to acquire access of trusted forest. So, enter the credentials and click on Next.

Note: If the organization configured two-way trust, then user will not be prompted for entering credentials.

5. From Select linked master account page, you need to perform the following steps:

  • In linked domain controller box, choose a relevant domain controller in order to get the list of user accounts in account forest to pick the linked master account.
  • Under Linked master account, click on Browse to locate user account. Then, click on OK >> Next.

6. In Enter general information page, fill the appropriate box with relevant information.

  • Name:– Enter a suitable name for the user.
  • Organizational Unit (or OU):- Click on Browser and select a different Organizational Unit instead of default OU and click on OK.
  • User logon name: Mention a logon name in order to make a linked mailbox.

7. After that, click on More options to provide additional steps. Else, hit the Save button

8. Finally, the linked mailboxes created in Exchange.

After understanding about linked mailboxes, let’s go through the technique for importing this mailbox to O365 account.

Techniques to Migrate Exchange 2010 Linked Mailboxes to Office 365

On a fundamental level, there are two ways to transfer linked mailboxes of Exchange Server in Exchange Online. But, to use both the methods, it is must to convert Linked mailbox into normal user mailbox. Because there is no workaround that directly imports this type of mailbox into Exchange Online. And, it is very easy to convert a linked mailbox into a normal user mailbox without any trouble using Exchange management shell. For this, you only need to execute below EMS cmdlets.

1. First of all, grant permission to user account-

New-ManagementRoleAssignment -Role “Mailbox Import Export” -User “Domain\UserName”

2. Now, convert the linked mailboxes into user mailboxes.

Set -User –Identity -LinkedMasterAccount $null

After the conversion process, refer the below approaches for migration procedure.

#Approach 1: Use Cut-Over Migration Way

This workaround come under the manual method where we use a specific Cut-Over technique to migrate Exchange Server mailboxes into Office 365 account. In Cutover migration, organization can only import 2000 mailboxes or less than that in Exchange Online account. It has various stages that user need to follow for the import process.

Stage A: Analyse the domain
Stage B: Establish connect between email system and O365
Stage C: Make cutover migration batch
Stage D: Start the process
Stage E: Migrate email to O365 directly
Stage F: Remove the migration batch
Stage G: Allot licenses to O365 users
Stage H: Perform post-migration processes

Unfortunately, Cutover Migration Has Some Consequences

It is true that manual way to migrate Exchange 2010 linked mailboxes to Office 365 has few downsides. The major ones are mentioned here.

  • Lots of stages are included in cutover migration. And, multiple steps are taking place in each stage. Hence, it is a quite complex and time-consuming process.
  • Good technical knowledge and sufficient resources are required.
  • There is no guarantee that the entire mailbox data will import into Office 365.

Above all, these demerits make it inappropriate for the same process. So, it is advised to use next workaround if you really care about your data.

#Approach 2: Use Reliable Exchange to Office 365 Migration Software

To overcome cut-over method limitations, we suggest to use an outstanding utility entitled as Exchange to Office 365 Migration Software. It is an efficient utility that effortlessly imports Exchange mailboxes to O365 account within few clicks. In fact, all the mailbox items such as email, contacts, calendars etc import in Exchange Online in least amount of time. Also, the user needs to follow some simple steps and entire task will complete smoothly.

1. Open Software and click on Export.

2. All the details associated with Active Directory and Exchange displayed on the screen. You can view the content of individual mailbox by right-click on it. Then, click on Next.

3. Next, enter the credentials of Office 365 and click on Next

4. As per requirement, you can use filter option and click on Export to initiate the process.

Opt the Solution That You Find Suitable

In this post, we have covered each information related to migrating Exchange 2010 linked mailboxes to Office 365 procedure. Even, the two workarounds illustrated that can import the Exchange mailboxes into O365. Now, it is up to the user, which method they find suitable for migration task.

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