At this point there are two e-mail services offered at TUM to handle your e-mails. The current “Microsoft Exchange” and the older system “MyTUM Mailserver”. The old mail system “MyTUM” is closed down on Sep. 30th 2018 to consolidate the IT services.
All users of the MyTUM mail system must move their e-mails to Exchange until Sep. 30th. They need to change the e-mail configuration in TUMonline and in their mail client (Outlook, Thunderbird, Apple Mail). They find an automatic assistant in TUMonline to move their e-mails.
The old e-mails are stored in the new Exchange mailbox after the migration – as will all new received e-mails from that point on. All e-mail addresses will still persist, including all “@mytum.de” e-mail addresses.
A detailed manual to migrate your e-mails can be found here: https://wiki.tum.de/display/docs/MyTUM+Mail+Migration