Office Mix Preview -service will be shut down at 1.5.2018. Office Mix Preview has been helping users to create and share interactive online recordings of their presentations. Thanks to the positive feedback from users during the Preview, Microsoft has decided to end Office Mix and to integrate its best features directly into PowerPoint, Microsoft Stream, and Microsoft Forms for Office 365 subscribers on Windows PCs (requires Office ProPlus-version).
If you have been using Office Mix presentations, you can transfer them to Office Stream like this:
1.) Log in to https://mix.office.com
2.) Click “Migrate” and accept transfer process
3.) If needed, log in again and wait for migration process to complete
4.) Check/confirm results at https://mix.office.com