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Office 365 IMAP Email Migration

Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

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Page 1: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

Office 365 IMAP Email

Migration

Page 2: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

Introduction

I am Microsoft Expert, Certified Trainer, Specialist and Certified Professional with 6+ year of I.T industry

Experience.

Certified in Microsoft Solutions Expert (MCSE): Messaging & Productivity, Microsoft Certified Trainer

(MCT), Microsoft Certified Solutions Associate (MCSA) in Office 365, Hyper-V, Microsoft Azure, MCP, MTA,

MCS and overall 27+ certifications.

I have Master of Science (MS) Field Of Study Computer Science.

Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync,

and Troubleshooting Sync Issues, Implementing SMTP Servers, Hybrid Deployments with Exchange 2010

SP3, 2013, 2016. Implementing ADFS Infrastructure. Email migration through Coutover, IMAP and PST

Method.

Azure: Manage hosting plans, Deploy workloads on Azure virtual machines (VMs), Implement images and

disks, Perform configuration management, Configure VM networking, Configure VM resiliency, Design and

implement VM storage, Monitor VMs, Configure cloud services and roles, Deploy and manage cloud

services, Monitor cloud services, Implement blobs and Azure files, Manage access, Configure diagnostics,

monitoring, and analytics, Implement SQL databases, Implement recovery services, Integrate an Azure AD

with existing directories, Configure the Application Access Panel, Integrate an app with Azure AD,

Integrate an Azure AD with existing directories, Configure the Application Access Panel, Integrate an app

with Azure AD etc.

Email: [email protected]

LinkedIn: https://www.linkedin.com/in/abdullahbinaltaf

Twitter: https://twitter.com/abdullahaltaf09

Blog: http://microsofttechnologie.blogspot.com/

Page 3: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

How the IMAP migration process works

Here's a description of the IMAP migration process. It includes steps performed by an administrator and the migration process performed by Exchange Online. For preparation tasks and step-by-step instructions, see Migrate Email from an IMAP Server to Exchange Online Mailboxes.

1. The administrator provisions new Exchange Online mailboxes by creating Office 365 user accounts and assigning Exchange Online user licenses. For more information, see Create User Mailboxes in Exchange Online.

2. The administrator creates a CSV file that contains a row for each user whose IMAP mailbox will be migrated.

3. The administrator creates and starts an IMAP migration batch using the Migration dashboard in the EAC or using the Shell.

4. After the administrator starts the migration batch, Exchange Online does the following: o Creates a migration request for each user listed in the CSV file. Each migration request

contains the user name and encrypted password for the account in the IMAP messaging system.

o Starts processing migration requests. This part of the process is called initial synchronization. For each user listed in the CSV file, messages from the IMAP mailbox are copied to the corresponding Exchange Online mailbox until all the mailbox data is migrated. Exchange Online processes up to N migration requests at one time, where N is the maximum number of concurrent migrations that the administrator specified when creating the migration endpoint used for the migration batch. By default, initial synchronization is performed on 20 mailboxes at a time until all mailboxes in the migration batch have been migrated.

o Processes the migration requests for all the users listed in the CSV file. 5. When initial synchronization is completed for a migration batch, Exchange Online sends a status

email message to the administrator. This message lists the number of mailboxes that were successfully migrated and how many couldn’t be migrated. The message also includes links to migration statistics and error reports that contain more detailed information.

6. After initial synchronization is complete for the migration batch, mailboxes in the IMAP messaging system and the corresponding Exchange Online mailboxes are synchronized every 24 hours. This is called incremental synchronization. This means that any new messages sent to the mailboxes on the IMAP server are copied to the corresponding Exchange Online mailboxes. By default, incremental synchronization is performed on 10 mailboxes at a time until all mailboxes in the migration batch are synchronized. Incremental synchronization continues until the administrator stops or deletes the migration batch.

Note:

During incremental synchronization, deletions made in an IMAP mailbox are synchronized to the corresponding Exchange Online mailbox. This means that if a user deletes an item from an IMAP mailbox, it will be deleted from the Exchange Online mailbox.

7. The administrator creates and starts additional migration batches, if necessary. 8. After the administrator resolves any migration issues and all IMAP mailboxes have been

successfully migrated, and users are using their Exchange Online mailboxes (and no longer using their mailboxes on the IMAP system), the administrator updates the organization's MX record to point to their Office 365 email organization. This causes email messages to be delivered directly to users' Exchange Online mailboxes.

9. After the change to the MX record has been propagated and mail is flowing directly to Exchange Online mailboxes, the administrator deletes the IMAP migration batches. After the migration

Page 4: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

batch is deleted, mailboxes on the IMAP system are no longer synchronized with Exchange Online mailboxes.

From <https://technet.microsoft.com/en-us/library/jj200751(v=exchg.150).aspx>

Page 5: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

EmailAddress specifies the user ID for the user's Exchange Online mailbox. UserName specifies the logon name for the account to use to access the mailbox on the IMAP server. Password specifies the password for the account in the UserName column.

EmailAddress UserName Password

[email protected] [email protected] ancd

[email protected] [email protected] ancd

[email protected] [email protected] ancd

Page 6: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing

Provide Bach name: Maximum concurrent migration: 20 Maximum concurrent Incremental Sync: 10

Page 7: Office 365 IMAP Email Migration · Office 365: Administering Office 365 Accounts, Office 365 Single Sign on (SSO), Implementing Direct Sync, and Troubleshooting Sync Issues, Implementing