Outlook.com has a calendar feature by which you can publish your calendar in a read-only mode using a web link or as an ICS file. It can then be viewed by anyone using a browser.
Here is how to use it:
Login to Outlook.com and click on the gear icon. Then choose View all Outlook settings.
From the Settings section, go to Calendar > Shared calendars.
Under the Publish a calendar section, select...