If you have a need to enable users in your Microsoft Exchange 2003 / 2007 environment, then it’s really quite simple, just follow the below process:
1) Open Outlook for the user who’s calendar you want to share
2) Right click to the top left of the screen where it says ‘Mailbox – << Username >>’ and select ‘Properties for Mailbox – << Username >>’
3) Select the ‘Permissions’ tab
4) Click the ‘Add’ button
5) Select the user/s you wish to grant permissions to and click ‘OK’
6) Select the user/s (to select more than one user, hold down the ‘Ctrl’ key whilst clicking)
7) Tick the box below labelled ‘Folder Visible’
8) Click ‘OK’
9) Right click on your ‘Calendar’ folder and select ‘Properties’
10) Select the ‘Permissions’ tab
11) Click the ‘Add’ button
12) Select the user/s you wish to grant permissions to and click ‘OK’
13) Select the user/s (to select more than one user, hold down the ‘Ctrl’ key whilst clicking)
14) In the ‘Permissions Level’ drop down list select ‘Editor’.
15) Click ‘OK’
Then on the users you’ve delegated access follow the below:
1) Open Outlook for the user who you’ve delegated the calendar access to
2) Right click to the top left of the screen where it says ‘Mailbox – << Username >>’ and select ‘Properties for Mailbox – << Username >>’
3) Click the ‘Advanced’ button
4) Select the ‘Advanced’ tab
5) Click the ‘Add’ button
6) Type a few letters of the username for the caledar you have delegated them access to and click ‘OK’
7) If prompted, select the user
8) Click ‘OK’
9) Click ‘OK’
10) Repeat again for all the other users that need access