Caution with 2010 Inactivate: It causes the follower to jump to the Project Start. When opened in 2016 and perhaps 2013, the following task Finish date remains as before the Inactivation. But on the table, “Schedule” you will see that the Late Finish goes to beginning of the Project. Since Total Slack is Late Finish minus Finish, you get BIG negative Total Slack. The fix in 2010 is to manually adjust the predecessors and successors to circumvent the Inactivated task.
On a schedule created in 2016 and perhaps 2013, inactivating a task causes the successor task to take on the Start date of the Inactivated task.