Apparently the new Outlook Social Connector will fix this for you according to ReadWriteWeb.com
The previous version of this connector allowed you to sync email and contacts data between Outlook and Hotmail for free, but calendar sync required a subscription service. With this new version, however, calendar sync is now free and it includes the ability to work with Live Calendar beta. And because Live Calendar also supports calendar sharing, those shared calendars will sync back to Outlook, too.
For someone who uses an Outlook calendar at work, keeps a personal calendar in Hotmail, and perhaps has a shared family calendar in Live Calendar, this new sync tool will be incredibly useful. Whether you're online or offline, all your calendars are available from one place: Outlook.
In order to do this, you need to be able to "publish" your calendar data to the web.
Naturally enough, most enterprises are "reluctant" to do this! As it leaks all kinds of information very easily.
To get round that problem, Microsoft allow the Free/Busy schedule to be published with a very limited amount of information in it. However, very few enterprises that I know of even publish that outside of their organisation. There are really good reasons not to leak the availability of corporate staff outside of the organisation so it is certainly a security risk.
What most people are now doing is to use mobile devices to aggregate their calendar and task information. On my iPhone and iPad for example, I aggregate calendars from Exchange (work, which has significant security specifications), my consultancy business, my personal calendar (Google), my wife's and childrens calendars (also Google) and some open Google calendars such as the school holiday calendar. I can turn them on or off as required.
So to directly answer your question, you will need to persuade your enterprise IT people to set up calendar publishing to the Internet using an iCal interface. This can then be added to your Google calendar.
Best Answer
Should be pretty easy to do. I use EVO Collaborator for Outlook myself to sync Outlook.com to my Outlook (as well as other services) And I sync contacts,calendar and mails.
You can try it out and see if it works for you :)
A blogpost on syncing Outlook and Outlook.com here : http://outlookandmacosxserver.blogspot.com/2015/06/how-to-sync-windows-live-hotmail.html