How do I give someone else access to my Calendar and Email

Similar to having an assistant help you manage your incoming paper mail, you can use Microsoft Outlook to allow another person, known as a delegate, to receive and respond to e-mail messages and meeting requests and responses on your behalf. You can also grant additional permissions that allow your delegate to read, create, or have more control over items in your Microsoft Exchange Server mailbox.

The person who is given access to your calendar is called a Delegate.

If you are using an Apple computer, follow these steps;

1. Open Outlook
2. Switch to Calendar view in the bottom left of the Outlook window. 
3. In the left pane, make sure the right calendar is highlighted. Take note that it may be a Sub-calendar of one of the visible ones. Use the small arrow to the left to expand the sub-menu.
4. Switch to the Organize tab at the top of the Outlook window.
5. Select Calendar Permissions.
6. Use the + button to find the person you want to make your Delegate
7. Use the settings below the white box to give the user the permissions you would like them to have.
   1. To make them a Delegate who can create meetings on your behalf, choose Delegate from the drop-down menu
8. Click Add to finalise the setting and then click Done. your delegate(s) should see your calendar after a short while.

If you are using a Windows computer, follow these steps;

1. Open Outlook
2. Click the File tab
3. Click Account Settings, and then click Delegate Access
4. Click Add
5. Type the name of the person whom you want to designate as your Delegate, or search for and them click their name in the search results list
6. Click Add, and then click OK
7. in the Delegate Permissions dialog box, you can access the default permissions settings, or select custom access to Exchange folders.
   1. If a delegate needs permission to work only with meeting requests and responses, the default permission settings, including Delegate receives copies of meeting-related messages sent to me, are sufficient. You can leave the Inbox permission setting at None. Meeting requests and responses will go directly to the delegate's Inbox.

8. To send a message to notify the delegate of the changed permissions, select the Automatically send a message to delegate summarizing these permissions check box.

9. If you want, select the Delegate can see my private items check box.

10. Click OK.

Content taken from https://support.office.com/en-us/article/Allow-someone-else-to-manage-your-mail-and-calendar-41c40c04-3bd1-4d22-963a-28eafec25926