How can I share 1 calender between several users for Outlook

fascin8 used Ask the Experts™
I need to share a calender on a workgroup with several users.  All should be able to update the calender not just view it.  I am not running an Exchange server.  I've looked at software options like ShareO for Outlook.  Are there any internal methods I could try instead?
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You can also try Google Calendar - 
if using outlook 2007 try this

Introduction to calendar sharing
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Tags  calendar; calendar sharing; e-mail; Internet calendar; merge; Outlook; permissions; search; share; view
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You can share calendar information with other people by using Microsoft Office Outlook 2007 in many ways.

In Calendar, in the Navigation Pane (Navigation Pane: The column on the left side of the Outlook window that includes panes such as Shortcuts or Mail and the shortcuts or folders within each pane. Click a folder to show the items in the folder.), there are several links to help you get started quickly with calendar sharing.

This article describes the ways to share calendar information by using the links in the Calendar Navigation Pane.

The links that you see will vary, depending on the accounts that are configured in your Outlook profile. For example, this illustration is what a person with a Microsoft Exchange account will see.

Open a Shared Calendar   When you use an Exchange account, you can open another person's default Exchange Calendar if the person has granted you permission to do so.
If the other person whose Calendar you want to open has not granted you permission to view it, Outlook prompts you to ask the person for the permission you need. If you click Yes, a sharing request e-mail message opens automatically. The message requests the person to share his or her Calendar with you and also provides the option to share your default Calendar with him or her.

After you access a shared Calendar for the first time, the Calendar is added to the Navigation Pane. The next time you want to view the shared Calendar, you can click it in the Navigation Pane. For more information, see Share calendar information quickly with Navigation Pane links.

Search Calendars Online   You can search Microsoft Office Online for Internet Calendars that you can view and subscribe to in Office Outlook 2007.
Share My Calendar   When you use an Exchange account, you can share your default Exchange Calendar with someone. This person receives an e-mail notification that you have shared your Calendar. You can also request that the recipient share his or her Exchange Calendar with you. For more information, see Share calendar information quickly with Navigation Pane links.
Tip  If you want to share a calendar that you created that is not your default Calendar, in the Navigation Pane, right-click the calendar name, and then click Share calendar name.

Send a Calendar via E-mail   You can send any of the calendars you own to another person in an e-mail message. This is a type of Internet Calendar called a Calendar Snapshot. The calendar appears within the body of an e-mail message. However, an Office Outlook 2007 user who receives the Calendar Snapshot can choose to open the calendar as an Outlook calendar. Doing so can display the Calendar Snapshot and the current calendar in side-by-side mode or calendar overlay mode.
Recipients of Calendar Snapshots do not receive the changes that you make to your calendar unless you send them a new Calendar Snapshot. For more information, see Share calendar information quickly with Navigation Pane links.

For calendars that recipients can subscribe to and keep up-to-date with changes that you make, consider using Internet calendar publishing. For more information, see the next section, Publish My Calendar.

Publish My Calendar   You can publish your default Office Outlook 2007 Calendar to Office Online and control who can access your calendar on Office Online. Calendars published to Office Online are searchable, which helps other Office Online users find calendars of interest. Publishing an Internet Calendar requires neither the publisher nor the user to use an Exchange account. For more information, see Share your calendar on Office Online.
Tip  If you have access to a Web server that supports the World Wide Web Distributed Authoring and Versioning (WebDAV) protocol, you can choose to publish calendars to that server instead. However, publishing to Office Online provides improved control over who can access your calendar. For more information, see Share your calendar on a Web server.

Add a New Group   By default, in the Navigation Pane, Office Outlook 2007 organizes your calendars into three groups — My Calendars, People's Calendars, and Other Calendars. You can rename these groups or create additional calendar groups to organize the calendars in a way that fits your work style better.
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