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Complete Guide For Migrating On Office 365 Using Cutover Migration – Part 1!

by Lalita Negi on April 20th 2018

If you have already decided to migrate on Office 365 using cutover migration, then this guide will prove quite beneficial for you as it contains information about how to migrate easily without any flaw. This guide covers every aspect related to Office 365 migration and in this part, we cover planning and things you need to do before starting the cutover migration process.

Basically, when a user migrates all mailboxes including every content inside of every user in the one go, it is referred as cutover migration process. Selection of cutover migration depends on following factors.

•           If on-premises Exchange business comprises of less than two thousand mailboxes.

•           Or if you presently use Microsoft Exchange Server 2013, Microsoft Exchange Server 2010, Microsoft Exchange Server 2007, or Microsoft Exchange Server 2003 as your on-premises Exchange business.

So, if these conditions apply to you, then cutover migration process will be the best choice for migrating to Office 365. After choosing cutover migration next is to make a thorough plan for Office 365 migration and here are aspects to be taken into account.

Essential Factors To Remember

Cutover migration is a successful method to migrate email content to Office 365 for any business. Though it requires one to plan carefully. Before jumping into this process, following factors need to be considered.

1.            It can take few days of time to move the whole email organization on Office 365. After that, user accounts managing will also take some time in Office 365.

2.           You can migrate mailboxes up to two thousand using cutover migration. Still, we recommend you to migrate only 150 mailboxes to Office 365.

3.          Your primary domain that is used for the on-premises Exchange organization has to be regarded as the domain you own in Office 365 organization.

4.           Once the migration process is over, every single user having on-premises Exchange account will be considered as a single user in Microsoft Office 365. However, there will still be a need to assign certain licenses to individual users whose email accounts have got migrated.

Expected Effects On Users

Once you set up your Office 365 and on-premises organizations with cutover migration, this job will put some certain effect on all users. Following mentioned some of the common effects that you will experience.

     Users and Administrators have to configure Desktop Computers – Ensure that all desktop PCs are properly updated and prepared for Office 365. By doing so, users will be able to use various credentials of local user while signing into their account in Office 365 using desktop apps. Those users who have permission for application installation will be able to set up and update their desktops on their own. Once the updates are done, one can easily send emails using Outlook 2010, Outlook 2007 and Outlook 2013.

     Delay Possible In Route Emails – Until the record in MX gets changed, emails that are sent to users of On-Premises and have email boxes had migrated to Microsoft Office 365 will be routed to the mailboxes of on-premises Exchange server.

After being familiar with these changes next comes to explore how this cutover migration process works and this information is right here.

Explaining How Cutover Migration Process Works

Cutover Migration Process Works
Cutover Migration Process Works

To perform cutover migration, there are some certain steps which we are going to describe here:

First of all, the admin makes a communication with users for upcoming changes and also authenticates the ownership of domain with the registrar of domain.

After that, the administrator makes the servers ready for the migration using cutover method and also makes mail-enabled empty groups of security in Microsoft Office 365.

In the third step, the admin links Office 365 over on-premises email exchange system.

Now, the admin steps up to migrate all mailboxes and after that authenticates migration.

Grant licenses of Office 365 to every user.

Then, admin starts email routing to MS Office 365 straight by configuring domain

After that, admin authenticates the changed routing and removes the batch of cutover migration.

In this step, the admin accomplishes all post-migration jobs in MS Office 365 and also decommissions the servers of on-premises Exchange, though it is an optional task.

At last, the admin issues a welcome letter, telling every user about being migrated to Office 365. This letter contains information related to sign in the new mailboxes in Office 365.

To get smooth cutover migrations you can consult Server Consultancy through email at or call us at 0203 727 2000

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