Connection settings may change in an existing IMAP migration endpoint, disrupting the user mailbox migration process. In such cases, you need to remove the endpoint and recreate it via EAC in Office tenant. This may also occur if the user account you are using for migration has some issues. You may try using another account or create a new account and add the account to Organization Management and Recipient Management role group. You may encounter an error, such as,. This usually occurs when you can't reach port or on the IMAP server.
To troubleshoot this, use the Telnet tool. After downloading the tool, open CMD and navigate to the location where Telnet is located and then run the following command,. The port should be or If the command output is blank, the connection is successful. However, if you get the connection error in the output, ensure appropriate ports are published, i.
The error may occur in the following scenarios,. The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. No jargon. Pictures helped. Didn't match my screen.
Incorrect instructions. Too technical. You can migrate them in batches at your convenience. We'd give you the exact steps if we could, but there are so many different email systems out there that you need to find out these steps on your own.
When you find the list of mailboxes, keep the window open so you can refer to them. Keep the Microsoft admin center page open, too. Make sure they match the screenshot exactly and don't contain spaces. Enter one mailbox per row. Column A is the email address of the user's Microsoft or Office mailbox.
Column B is the combination of the mailbox admin name and username that's specific to your source email system. In the migration file, each cell in the UserName column consists of two combined names: the username of the person whose email is being migrated, and the username of the mailbox admin account.
The supported format for mailbox admin credentials is different depending on your source email system. Here are the formats for several types of source email systems. You have a mailbox admin account, where the username is mailadmin and the password is P ssw0rd.
Here's what your migration file would look like:. Let's say you're migrating email from a Dovecot IMAP server using the mailbox admin credentials mailadmin and P ssw0rd. Let's say you're migrating email using the mailbox admin credentials mailadmin and P ssw0rd. Instead, you can set up your source email system to use virtual shared folders.
Virtual shared folders allow you to use the mailbox admin credentials to access user mailboxes on the source email system. To migrate mailboxes after you set up virtual shared folders on your source email system, you have to include the optional attribute UserRoot in the migration file. This attribute specifies the location of each user's mailbox in the virtual shared folder structure on the source email system.
To migrate email successfully, Microsoft or Office needs to connect and communicate with the source email system. To do this, Microsoft or Office uses a migration endpoint. This is a technical term that describes the settings that are used to create the connection.
You create the migration endpoint in this task. Open the Exchange admin center. Click New to create a new migration endpoint. Click Next. The migration service uses the settings to test the connection to your email server.
If the connection works, the Enter general information page appears. On the Enter general information page, type a Migration endpoint name , for example, Test5-endpoint. Leave the other two boxes blank to use the default values.
You use a migration batch to migrate groups of email to Microsoft or Office mailboxes at the same time. The batch consists of the mailboxes that you listed in the migration file in the previous task. We recommend that you create a test migration batch with a small number of mailboxes to first test the process.
Then compare the total running time for each test batch. This comparison helps you estimate how long it could take to migrate all your mailboxes, how large each migration batch should be, and how many simultaneous connections to the source email system you should use to balance migration speed and internet bandwidth.
On the Select the users page , click Browse to specify the migration file you created. After you select your migration file, Microsoft or Office checks it to make sure of the following:. If any one of these checks fails, you'll get an error that describes the reason for the failure. If you get an error, you have to fix the migration file and resubmit it to create a migration batch. After Microsoft or Office validates the migration file, it displays the number of users listed in the file as the number of mailboxes to migrate.
On this page, select the migration endpoint that you created in Step 3: Connect Microsoft or Office to your email system. The default migration batch name that's displayed is the name of the migration file that you specified. The migration batch name is displayed in the list on the migration dashboard after you create the migration batch. You can also optionally enter the names of the folders you want to exclude from migrating, for example Shared, Junk Email, and Deleted.
If you're trying to connect another email account to Outlook. For Gmail POP accounts, follow these steps. For Yahoo POP accounts, follow these steps. You may receive a connection error if you configured your Outlook. For now, try the following workaround:. Go to account. Under Recent activity find the Session Type event that matches the most recent time you received the connection error and click to expand it. For more information on how to use the Recent activity page, go to What is the recent activity page?
If you use Outlook. For instructions about how to reconfigure your account to use POP, contact your email account provider. Note: You will need to sign in first to get support.
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