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Within the ribbon settings, users with the required permissions can lock a thread to prevent any further replies or updates by clicking the Lock Topic button in the List Tools > Items ribbon of the Discussion Board Plus list or by selecting the Lock Topic option in the item drop-down menu for a topic.
Threads can be unlocked using the Unlock Topic button or item drop-down menu option. When this feature is disabled, the Lock Topic and Unlock Topic options are not available.
After a thread is locked, all editing actions are disabled for everyone except site collection administrators:
- Existing posts cannot be edited.
- New replies cannot be posted.
- Answers cannot be suggested, verified, or removed.