A lot of Salesforce users & admins have asked for a task history tracking option in Salesforce in order to track status & comment changes or to generate global usage/trend report.
It is now possible to do that with the following app & package, just install ZaapIT + History Tracking package (3 steps):
1) Install Smart-Tables / Smart-Activity-manager
2) Install the below ZaapIT history extension package:
Use this URL to install the package into any organization:
Use this URL to install the package into any Sandbox:
3) Add the history grid to the page layout as a tab (use zaapit_tb_task_rl1 page).