Thread:Senoc the Original/@comment-27642721-20180514135311/@comment-27642721-20180514140455

This seems to be describing the problem:

https://support.office.com/en-us/article/outlook-com-email-account-appears-as-outlook-long-series-of-letters-and-numbers-outlook-com-in-outlook-for-windows-90ed7938-7f21-4cb5-a69d-a3b79ea4eafd