Hi Christian,
Currently we don’t have any information regarding connecting Office 365 User ID (MOS ID) with third party services.
Here I share some information which may be helpful:
Privacy, Security, and Transparency
User Account Management
Identity and Authentication in the cloud: Office 2013 and Office 365 (Poster)
In addition, I suggest you periodically check our Technical Blog for the latest Office 365 Service updates:
http://community.office365.com/en-us/blogs/office_365_technical_blog/default.aspx
Thanks,
Evan Zhang