Final answer:
The last step in the Meeting window after changing meeting details is to click the 'Send Update' button, which informs attendees of the alterations. For Word documents, changes can be accepted or rejected via the Review tab.
Step-by-step explanation:
When you change the details of an existing meeting, the last step in the Meeting window is to click the Send Update button. This will notify attendees of the changes made. For tasks such as accepting or rejecting changes in a Word document, you would open the document and click the Review tab above the tools ribbon. Then you can navigate through changes using the Previous and Next buttons beside the Accept and Reject options in the tools ribbon.