This software gets added to Outlook EVERY TIME Itunes is run, even if it is
deleted. Find it in Tools - Options - Other - Advanced Options - Com
Addins. It is designed to sync calendars between Outlook and Apple
products.

Searching Google provides many examples of Outlook probems caussed by the
Itunes Outlook Addin (Outlook won't shut down; Outlook remains in task
manager processes; disruption of Outlook Calendar).

Until Microsoft provides a software fix (ideally, an option to lock out com
addins), be prepared to manually delete this program EVERY TIME you use the
Itunes software.