![]() This is what is shown in the username column under Users > Active users in the Microsoft 365 admin center.Ĭolumn B is the sign-in name (for example, alberta, or often, for the user's mailbox on the source email system.Ī lot of email systems use the entire email address as the sign-in name. Enter one mailbox per row:Ĭolumn A is the email address of the Microsoft 365 or Office 365 mailbox. Next, enter the email address, username, and password for each mailbox you want to migrate. Make sure they match the picture exactly and don't contain spaces. Use the following screenshot as a template to create the migration file in Excel. When you find the list of mailboxes, keep this window open. 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 this out on your own. Go to your source email system (the one you're migrating from), and navigate to the list of mailboxes you want to migrate. You can include up to 50,000 mailboxes (one row for each user) in your migration file, which can be as large as 10 MB.įor more information, see CSV files for IMAP migration batches. You can do them in batches at your convenience. You don't have to migrate all mailboxes at once. We're assuming you don't know user passwords, so you'll probably need to assign temporary passwords (by resetting the passwords) to all mailboxes during the migration. When you create the migration file, you must know the password of each mailbox to be migrated. You can use Excel 2013, Excel 2010, or Excel 2007. We use Excel in the instructions because it's the easiest way to create the migration file. Follow the steps in Create a list of user mailboxes using admin credentials to access them to learn how to access user mailboxes.Ĭreate the list of user mailboxes when you know the user passwords, or you'll reset the passwordsįor this task, you create a migration file that contains a list of mailboxes to migrate to Microsoft 365 or Office 365. Your source email system lets you use mailbox admin credentials to access user mailboxes, which means you don't need to know the passwords or reset them. Follow the steps in Create the list of user mailboxes when you know the user passwords, or you'll reset the passwords. You either know the password of each user's mailbox, or you need to reset the passwords to new passwords that you do know. The steps that are required to create the target mailboxes depend on how you access the mailboxes. You need access to user mailboxes before you can migrate them to Microsoft 365 or Office 365. Step 2: Create the list of mailboxes to migrate In POP and IMAP settings, your IMAP server name is listed in the IMAP setting section.įor more information about IMAP connections in Microsoft 365 or Office 365, see POP and IMAP account settings. In the Search all settings box, start typing "pop", and in the results, select POP and IMAP. Get the name of your source email server using Outlook on the web If your email client isn't described here, contact support for your source email system. In this task, we describe how to get the name of the system by using Outlook on the web (formerly known as Outlook Web App). The easiest way is by using an email client that's connected to your email system. ![]() There are many ways to get the name of your email system. Microsoft 365 or Office 365 needs the name of the source email server to migrate mailboxes from. Step 1: Find the full name of your current email server To add users, see Add users individually or in bulk. If you are using Office 365 operated by 21Vianet in China, see Add a domain to Microsoft 365. ![]() For instructions, see Add a domain to Microsoft 365. ![]() If you use an email domain in your IMAP email environment, and you also want to use the email domain in Microsoft 365 or Office 365, you need to add the domain to Microsoft 365 or Office 365 as an accepted domain before you create users in Microsoft 365 or Office 365. Each user must have a target Microsoft 365 or Office 365 mailbox for the IMAP migration. You need to create your users in Microsoft 365 or Office 365 before you migrate their IMAP mailboxes from the source email environment. Here are the tasks to do when you're ready to get started with migrating your IMAP mailboxes. Looking for PowerShell commands for general IMAP migrations? See Use PowerShell to perform an IMAP migration to Microsoft 365 or Office 365. As part of the process of deploying Microsoft 365 or Office 365, you can choose to migrate the contents of user mailboxes from an Internet Mail Access Protocol (IMAP) email service to Microsoft 365 or Office 365.
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