Hi All,
One of the user from our organization has left he has some 300 active task's assigned to his name, how we can close this task's.
Thanks in Advance
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From my perspective, tasks assigned to users are a crucial part of a business process and can/should not be just "closed". I recommend to reassign these tasks to someone else.
Adding to what Stefan said if the tasks are assigned to the group and not the user, you can leave it as is and other people from the same group can complete them. But if there are any accepted tasks or any tasks directly assigned to the user, then those tasks need to be reassigned to someone having the same set of rights in the application.