Can you check the version of a SharePoint Online ? (or how can you know that your SharePoint Online moved to 2013…)

A colleague recently asked me this question, so let’s share the answer : yes check the http response headers; now how can you do this ?

Browse the web site with Internet Explorer (in my case I browsed our corporate public web site based on O365 that we published a few months ago):

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2°In the Tools Menu, start IE dev Tools

3°Click on Network and click on Start Capturing

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Browse the web site again

5°Select the first row :

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6°Switch to the Response headers and check the MicrosoftSharePointTeamServices header : starting with 14 means “SharePoint 2010”, etc…

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Conclusions

if I check the response header of my on premise RTM SharePoint 2013 running in Windows 2012, I get 15.0.0.45 (and Microsoft-IIS/8.0)

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and for the current Office 365 preview, I get 15.0.0.4433, which means that MS is running a more recent build than what we have on premise, but the servers (IIS/7.5) are still Windows 2008 R2 (in my case)

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