How do I give access to someone else on my Outlook Calendar on Exchange?

Enable Calendar Sharing:

Select Go from the drop down menu and click on Folder List
Click on Mailbox - to select your Exchange account
Right click on Mailbox - and then left-click on Properties
Click on the Permissions tab and then click Add...

Note:Before a user can access any of your folders (Inbox, Calendar, etc.) you must first give them general access to your Mailbox - ".

Granting permissions to the Default user will give everyone on the Exchange Server access to your account. Be careful not to do this.
Select the users you are granting permissions to.
To Add a user, select from the Global Address List, click on Add -> button and then click OK
After the user is added, you should change their Permission Level to Reviewer and then click OK
Right click on the Folder that you would like to share (Calendar, Tasks, Inbox, etc.) and then Left Click on Properties
You only need to set the Permission Level to Reviewer when giving access to the Mailbox - folder. For any other folder (for example, the Calendar), you can select the Permission Level that works best for you.

Select the desired Permission level that you would like to grant.
Repeat the above steps for each user you want to grant access to.
On the computer of the person you are giving access to:

Select Tools and then Email Accounts...

For Office 2000, go to Tools, select Services and continue at Step 12 below
Select View or change existing email accounts and then click Next
Select Microsoft Exchange Server and the click Change
Click on More Settings... and select the Advanced tab, and then click on Add...
Enter the email address or the name of the person whose calendar you are opening and click OK
Click OK again, click Next and then Finish. You should now be able to see a new Mailbox - which you can now use.

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