T-Online is a Germany-based news portal and email service owned by online advertising company Ströer. T-Online Email is Germany’s most preferred email service due to the robust data security provided by the company. However, many T-Online email users wish to migrate their emails to an efficient platform like Office 365, now known as Microsoft 365. Therefore, in this blog, I am going to explain different ways to migrate T-Online to Office 365. Along with providing tips like T-Online IMAP settings and many other helpful points to help you properly transfer your mailbox.

Table of Contents
  1. Reasons for T-Online Email to Office 365 Migration
  2. Preparations for T-Online to Office 365 Migration
  3. Create T-Online E-mail Passwort for Email Programs
  4. T-Online IMAP Settings
  5. Manually Move T-Online to Office 365
  6. Migrate T-Online Email to Office 365 Professionally
  7. Steps for the Software to Transfer Mailbox
  8. Conclusion

Reasons for T-Online Email to Office 365 Migration

Users have their own reasons for transferring. Therefore, below I have provided common reasons for your understanding.

  • The primary reason for the T-Online email to Office 365 transfer is sparse email storage. T-Online offers you 1 GB of email storage in the Freemail and Mail S plan. Mail M plan provides 15 GB of storage. Meanwhile, Office 365 offers an immense mailbox storage of 50 GB, which you can expand to 100 GB in some subscription plans.
  • Apart from the standard email encryption based on the SSL protocol (according to German data protection laws), T-Online doesn’t have any specific email security features. In contrast, Microsoft 365 offers DLP (Data Loss Prevention), MFA (Multifactor Authentication), and Threat Analysis, which make it the perfect platform for your sensitive emails.
  • T-Online Email is just a basic email service, which means users can only send and receive emails. On the contrary, Office 365 is a collection of productivity apps like Word, PowerPoint, Teams, and Outlook.
  • There are some users who are closing their T-Online account and want to switch to the Microsoft environment for better email facilities.
  • Moving T-Online emails to Office 365 makes it easier for you to manage your important messages in one place.
  • People transfer their emails from T-Online to Microsoft 365 to create a backup of their most important data.

Whatever the reason, you may need to transfer your mailbox. First, you must prepare yourself. There are some important steps that you must take.

Preparations for T-Online to Office 365 Migration

  • First of all, connect to a strong internet network. An unstable connection mid-process will cause you to lose emails or encounter synchronization errors.
  • Take a backup of your T-Online mailbox. It is necessary if something happens during the process and you have to recover your data.
  • Make sure your Microsoft 365 email has enough storage to transfer emails from T-Online.
  • Also, before you move your emails, check your mailbox for any email duplication, unnecessary emails, or emails that are not needed to transfer.

Create T-Online E-mail Passwort for Email Programs

T-Online provides you with two types of passwords: one that you use to log in to your T-Online webmail and one that you use when you are syncing with other apps like Outlook or Office 365. When you are adding your T-Online account to other programs.  You need an app password to create secure syncing between the two programs.  You can create one from the E-Mail Center.

  1. Sign in to your T-Online E-Mail Center. Then, click Zahnrad (gear icon) in the menu bar.
  2. Select Alle Einstellungen anzeigen (Show all settings). Click Passwörter (Passwords).
  3. Press the Passwort für E-Mail-Programme (Password for email programs) button. Type your app password two times and save the changes.

Now, when you are migrating your mailbox or configuring your account, use this password.

T-Online IMAP Settings

In this, I am going to provide the methods to migrate T-Online IMAP to Office 365 using the IMAP server. Hence, you must know the server settings. Note down these details in a safe and easy-to-find place.

T-Online IMAP Server Settings

  • Server: secureimap.t-online.de
  • Port: SSL/TLS – 993 and 143 for non-secure.
  • Encryption: SSL/TLS

T-Online.de SMTP Settings

  • Server: securesmtp.t-online.de
  • Port: SSL/TLS – 465 and STARTTLS/non-secure – 587
  • Encryption: SSL/TLS or STARTTLS

Now, you can start migrating your emails. Users can either use the manual or professional method to transfer T-Online.de emails to Microsoft 365. I am going to explain both methods.

Manually Move T-Online to Office 365

Microsoft 365 is integrated with the Outlook email client, which is a great way of configuring your account and move your emails. Here are the steps to do this.

  1. Log in to your MS Outlook and go to the File option.
  2. Click the Add Account button. (For new Outlook, go to Settings gear >> Accounts >> Add Account).
  3. Type a proper T-Online.de email address. Click Advanced options.
  4. Select Let me set up my account manually. Press Connect.
  5. Choose IMAP as the account type and provide the Email app password that you have created.
  6. Add the IMAP server settings of T-Online that I have mentioned above. Press the Next button.
  7. Once your account is successfully configured. Press Done.
  8. After that, you can move your T-Online emails in the Outlook folder by drag and drop way.

With this, you can easily transfer your emails. However, it takes time, as you have to first configure the account and then you can migrate them. Also, there is a chance that email missing during the process. For this reason, the professional method is much easier and a great option.

Migrate T-Online Email to Office 365 Professionally

Email migration from one platform to another is always a difficult challenge. Therefore, experts prefer automated software that can directly migrate T-Online to Office 365. SysTools IMAP Migration Tool is one of the best utilities that can easily move multiple T-Online mailboxes to Outlook or Microsoft 365. This software is available for Windows and macOS and can easily transfer specific emails without any issues. Here are the steps to move your emails using this tool.

Steps for the Software to Transfer Mailbox

  1. Install and run the software on your Windows or macOS computer.
    run the software
  2. Choose IMAP as the source and destination platform.
    select imap as source and destination
  3. Next, check the Email checkbox under Workload Selection. Check the Date Filter box and select two desired dates for a limited T-Online email to Office 365 migration, if you wish to.
    apply date filter
  4. Select the Other option under the Source section and enter T-Online’s IMAP port number and server details. Now click the Validate button to permit email and user reading permissions.
    add t-online server details
  5. Go to the Destination window, select Other, then provide your Office 365 port number and server details, and validate it.
    choose office 365
  6. Import your source and destination IDs using the mapping file by clicking Download Template.
    import mapping file
  7. Provide the password for both accounts. Click the Start Migration button.
    start migration

Conclusion

We discussed the two solutions to migrate T-Online to Office 365 manually and professionally. But before the process, I have provided tips that help you transfer the mailbox like create E-Mail Passwort and T-Online IMAP settings. Make sure you follow them properly before the migration. Manually transferring can be difficult for some people. Therefore, professional software is the best option, as many professionals and experts prefer this method as well.