Outlook – Sync the outlook (2007) calendar with hotmail calendar

You can use the free Google tool Google Apps Sync for Microsoft Outlook :

Google Apps Sync synchronizes nearly all of your personal contact information between Outlook and the Google Apps interface so you can reach colleagues, family, and other contacts from either interface.

You can download it from here.

You may also use file export and import, as described in:
Merge your Outlook and Gmail contacts

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.