vBulletin puts people into the Registered Users usergroup upon registration. You will need to use a promotion to move users with x posts into a new user group (lets call it PM Users).
Set the permissions for Registered Users to not allow Private Messaging, and then set the permissions for PM Users to allow it and all other permissions as applicable.
Then set up a promotion to move users from registered users to pm users after x posts. Run the scheduled task for user promotions (Scheduled Tasks > Scheduled Task Manager > User Promotions > Run) and all your current members with x posts will be moved straight away so saving the need for them to be disrupted while waiting for the scheduled task to run.
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