There is no option to get the account creation date using the web interface. The only people who can provide you with that information are Outlook.com support assuming that is even possible given you want information that predates Microsoft's ownership.
in any case, ignoring the " BEFORE Microsoft acquired it." portion of your question for a moment, some people have stated that they were able to get the account creation date while others have stated they could not obtain it when contacting Outlook.com support so can only assume from that, it depends on who answers your query but no one asked about a date pre Microsoft ownership
Your only option is to try
To contact Outlook.com support, log into your Outlook.com account using a browser and click on "Help' and then the ?
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