I am reading a lot that Office 365 has been patched, upgraded and now migrated to Server 2012 (and Office 2013).

How can I determine the versions of Sharepoint Server, services, etc. on which my Office 365 (Sharepoint Online) site(s) are run?
and of operating system?

I tried to search but all methods I could find require server/farm administration access to Sharepoint Server.

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So, self-trying to self-answer my own question, it seems impossible in development environment.

One of the workaround (from private communication by Hilary Stoupa) is to configure public access through internet to an Office365 (Sharepoint online) site and in http://network-tools.com select http headers and type your Sharepoint site below then hit go. This, could probably sometimes show the version of Sharepoint, at least ...

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