Missing Exchange?
Although it's easy for Exchange Server users to share a Calendar, users who use Outlook with POP3, IMAP, or HTTP mail accounts don't have that ability. While there are several third-party utilities that make it possible to share Calendar data among multiple Outlook users, you don't really need them. If you have your own Web server, you can publish users' Calendars to a Web page.
Publishing to Web Page
To publish users' Calendars to a Web page, first set up the shares on the Web server that will contain their Calendars. Set permissions on the folders to restrict access so that each user only has access to his or her folder. Then, the user only needs to open the Calendar, choose File | Save As Web Page, and choose the location on the server for the resulting HTML files. Others can then browse to the Web page to view that user's schedule.
You can make it even easier to locate a particular schedule by creating a page that links to all users' online Calendars.
Additional Options
Outlook doesn't offer much in terms of options for publishing a schedule to a Web page. For some additional options, check out Night Creation's Mobyle Office Publisher. This shareware application lets you publish from the Outlook Calendar, Contacts, Notes, and Tasks folders. http://www.mobyleoffice.com/