When you freeze a workflow, it will stop accepting new contacts and will perform actions only for subscribers who have already entered the workflow. You can resume the workflow anytime.
The autoresponder will only be sent to contacts that have been added to list before the scheduled activation date. "List freezing" means no contacts can be added to the autoresponder after activation.
Instant and time-based workflows will stop when the source list has been deleted. all of the defined actions have been stopped. custom fields used in the workflow criteria have been deleted. One-time workflows will stop after triggering at the ...
A workflow that is shut down will not perform actions on any contact, even those who have already entered the workflow. You cannot activate a workflow once it is shut down.