Publish your Outlook calendar to Office.comStep 1: Go to Calendar and look for this button: Home > Publish Online.
Step 2: Click the button and configure the publishing options.
Step 3: Set the detail level to "Full details". You will need the full details set so that Google Calendar can show the details of the calendar event.
Step 4: Set the permissions to "Only invited users ...". This is for added security for not to reveal your calendar events to anonymous eyes. You can set to "Anyone" for simplicity.
Step 5: Select your preferred "Time Span" of your calendar events.
Step 6: Click "OK" and your Outlook calendar will publish to Office.com. A pop up dialog box will inform you of the successful publication and ask if you like to send invitation to let people access your Outlook calendar.
Step 7: Click "Yes" and you will be presented with an email in compose mode. Enter your Gmail address and click "Send". You need to send this invitation so you can restrict the access to specific email address.
Subscribe to Outlook calendar using Google CalendarStep 1: You should now received an email from your Outlook email. Open the email and the email should have the webcal address of your published Outlook calendar at Office.com. The webcal address should look like this:
Step 2: Go to your Google Calendar. Under “Other calendars” list, drop-down the menu next to it. Select “Add by URL”.
Step 3: You will be prompt with a dialog box to ask you for the URL address of the ics file. Copy and paste the webcal address from your email into the URL box. Do not click “Add Calendar” yet!
Step 4: Replace the “webcal” text with “https” and click the “Add Calendar” button.
Your Google Calendar is now subscribing to your Outlook calendar. Every time when you receive new appointments or new events in your Outlook, your Google Calendar will automatically get updated through the published calendar in Office.com. This is because your Outlook will periodically update the published calendar in Office.com.
Note:Microsoft will discontinue calendar publishing on Office.com on April 5th, 2014.
20 FEB 2014:
Register an account at http://www.icalx.com and publish your Microsoft Outlook calendar (use the WebDav option from the drop down list) to the icalx.com. Once published, icalx.com will provide you with a link to the ics file. Use Google calendar to subscribe to the shared ics file.