In case the tasks are cancelled they will not be visible in the task tab.
How can a task be cancelled?
Cancel option available under actions in manage task page.

How do we check for cancelled tasks?
1. Manage task page:

2. Retrive task API:

However the cancelled tasks will not be available in task tab of a lead and there is no option to fetch deleted or cancelled tasks.
How can a task be cancelled?
Cancel option available under actions in manage task page.
How do we check for cancelled tasks?
1. Manage task page:
2. Retrive task API:
However the cancelled tasks will not be available in task tab of a lead and there is no option to fetch deleted or cancelled tasks.
