Revision 27 as of 2021-06-16 15:22:29

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Migrating your mailbox from ISG to Exchange


Some professorships and institutes at D-ITET have decided to use the exchange mail server instead of the D-ITET mail server. This guide is intended to show you the steps to be able to move your mail account to the exchange server. If certain steps in these instructions are unclear, please contact your technical contact first or create a ticket by sending an email to <>.

Pre-migration steps

There are some limitations on the Exchange Server which mean that not all emails can be transferred. You must have completed the following steps before you start the actual migration itself:

You can carry out the steps mentioned above at any time. /!\ But please do only carry out the following steps one day before or on the day of the migration at the earliest. /!\ Before the account can be migrated, you may have to delete existing forwards on the exchange server and set up new forwards on the ISG mail server. These forwards are necessary in order to receive the mails on the exchange server until the final changeover of the domain to the exchange server.

Remove any IAM forward

By default we set a forward on the exchange server so that you would not miss any mail sent to your IAM account directly. This forward needs ro be removed. To do so execute the following steps:

  1. visit

  2. Login with your username and password

  3. Click Self Service and Manage forward to adjust your forward settings.

  4. Remove any content in the Recipient Field and make sure Save and forward mails is not set. Then click Save.

Set a forward on the ISG mailserver

After removing the IAM forward you need to set a forward to the exchange server. The simplest way to do so is by using roundcube:

  1. Visit

  2. Login with your username and password

  3. Select Settings and then Filters

  4. By default you would see the isgdefault Filter set. This set contains the two rules Deduplicate and Vacation. Click the Create Button in the upper right frame and create a sieve rule like in the picture. Replace username in the action field with your username. Afterwards click Save.


From this moment on, every incoming email will be redirected to the exchange server. To be able to read any new email you either need to login with your credentials at the exchange webinterface or you need to configure a mail client to access the exchange server. If you used thunderbird on our server you should switch to Microsoft Outlook to access the exchange mailserver. Please refer to the Instructions / FAQ / How To / Tips Section on the ETH Mailbox Service Website to find instructions on how to configure a mail client to use the exchange mailserver.

Prepare an SSH-Client

Prepare an SSH-Client like openssh (linux/mac) or PuTTy (windows) to be able to carry out the synchronization with the assigned credentials (visible on the migration day in the Migration webinterface).

configuring PuTTy on Windows

  1. On our managed machines you should find PuTTy in the list of applications or by clicking the Windows Button in the left bottom frame and typing putty. If you are using a self managed machine install PuTTy from .

  2. PuTTy opens a pop-up window. In the Basic Settings make sure to add into the Hostname line, the port is set to 22 and the Connection Type is SSH.

  3. Select the Window Category on the left side and make sure to use 150 for Columns and 50 for Rows.

  4. Select Window/Translation Category on the left side and make sure to use ISO-8859-1:1998 (Latin-1, West Europe) for the Remote character set.

  5. Click Open on the bottom of the pop-up window to establish a connection. /!\ Do not login with your personal credentials! Use the migration credentials from the webinterface instead! /!\ PuTTy-Connect.png

Using openssh on linux / mac

Open a terminal and use the following command. Replace migruser by the migration user assigned to you (as seen in the webinterface). The password can also be found in the webinterface, but only on the day of migration.


Migration webinterface

Together with the technical contact of an institute, the ISG creates a list of the users to be migrated and sets a migration date for each account. As soon as the migration begins, all users can log in with their credentials at In this interface you can see: