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Share your Outlook Calendar with an Oracle or Google Calendar User

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Introduction to Internet Calendars
Internet Calendars are calendars that are shared through the Internet and are based upon an Internet standard.  This standard allows calendar information to be exchanged regardless of the application that is used to create or view the information. Internet Calendars use the iCalendar format and the .ics file name extension.

Outlook 2007 Internet Calendars
Outlook  Calendars are shared either by sharing one-time static calendars, known as Calendar Snapshots, or by publishing calendars to a special Web server designed to host calendars in the iCalendar format. The benefit of the latter is that as you make changes to the calendar, these changes are replicated to the Web server. This allows those who use an Internet Calendar Subscription to get the latest information automatically.

Sending a Calendar Snapshot
From an Outlook 2007 client you can send a Calendar snapshot using the "Send a Calendar via E-mail" task in the Outlook Task Pane (usually on the left side of the screen).  There are options to tailor the amount of information being transmitted.  The email will contain the calendar in a readable format and will also include an .ics file which can be loaded by some other calendaring tools.  You can also create an .ics file for your calendar by using "File/Save As" and selecting the *.ics option, and then include it as an attachment in an email.  Some calendaring systems, such as Google Calendar, will allow the user to Import the calendar snapshot, and then work with "merged" or side-by-side views of calendars.  For information on importing information in to a Google calendar, see the Google support page Migrate events from other applications.

Publishing an Outlook Calendar
Publishing an Outlook Calendar requires that a server has been set up to host the calendar.  You should consult your local support organization to determine if this service is available. Outlook can also save an HTML snapshot version of a calendar using "File/Save as Web Page." This web page would then need to be posted to a web server. For example, this may be suitable for publishing a static schedule for a weeklong seminar.

If you have a requirement to publish a dynamic Outlook Calendar but do not have a Web Server available, it is also possible to to have the Outlook Calendar synchronized with a Google Calendar, and the Google Calendar could then be shared with others.  See Synchronizing an Outlook and Google Calendar.

For More Information on Outlook Snapshots and Publishing

http://office.microsoft.com/en-us/outlook-help/introduction-to-internet-calendars-HA010039830.aspx