Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
SharePoint Stack Exchange is a question and answer site for SharePoint enthusiasts. It only takes a minute to sign up.
Is there any way to create a 2010 version site in Office 365?
There isn't. All new sites are created with the current version of the product. There is no way to do it in the UI and it's mentioned in their documentation. I'm trying to find a link for you.
Required, but never shown