The small window for editing a user mailbox can't show all of the mailbox features at once; you'll need to scroll. In this screenshot, all of them have been appended to the same screenshot for ease of display:
Here's where many of the real details are. You can set the following on this screen:
- Sharing policy: This controls the sharing of calendars and contacts with users outside the organization, and will default to whatever your organization's standard policy is, but you can create additional policies and apply them to specific users. The sales team, for instance, might have the need to be ...