A user had a question about adding appointments to calendars:
How can I add an appointment to my employees' Outlook calendar without needing to send a meeting request? I want it to be on the employee's calendar as a required event. I can view the calendars, but I don't have permission to add appointments. Is it possible to set something in Exchange to force this permission so that the employee doesn't have to accept the appointment?
Sure. You could ask each employee to give you non-editing author permissions to their calendar. The minimum requirement on the calendar is Folder Visible and Create Items, you'll also need Folder Visible permission on the mailbox root, where Outlook Today is.
If you need permissions set on a number of mailboxes, the Exchange administrator can use PowerShell to give your account permission to one or more employee's Calendars.
In Exchange 2013, use the Set-MailboxFolderPermissions cmdlet, identifying the folder in alias:folder format.
Set-MailboxFolderPermission -Identity employee-alias:\Calendar -User your-alias -AccessRights NonEditingAuthor
Non-editing author is the minimum needed to give your account CreateItems permissions.
For more information on the AccessRights and other available parameters, see Set-MailboxFolderPermission