There are many reasons why you may want to keep Google Calendar and Windows Live Calendar in sync. You might want to keep your phone calendar (synchronised via Google Calendar) in sync with multiple PCs with Outlook installed (via Outlook Hotmail Connector). You may also have multiple phones, some of which rely on Google Calendar, others which rely on Windows Live Calendar. Basically, if you use both of the services, it is a good idea to keep them in sync.
You will need:
- Microsoft Outlook (2003 or later, 32bit)
- Microsoft Outlook Hotmail Connector (32 bit)
- Google Calendar Sync
The key here is to make the Hotmail/Windows Live account the default data file in Outlook – it is this default with which Google Calendar Sync will synchronise. If you have other data files, it may be worth transferring your mail to Hotmail so that it is all in one place and deleting them so you only have one data file (synchronised with Hotmail) to manage. Data files can be managed via the File > Data File Management option in Outlook (or equivalent on the ribbon).
By setting the Hotmail/Windows Live account as the default, your rules will also work in Outlook 2003/2007 (they work regardless in 2010).
Let me know if you have any problems or found this advice useful :-)