I believe they can send the message, but you can't access it until you have your 10 posts. Oh, and once you've gotten your 10 posts, it does take the system a little time (30-60 minutes) to recognize the fact before applying the feature to your account.
It looks like you are over 10 posts now, anyway, but answering for others who may wander here with the same question. Both parties must have at least 10 posts to send or receive PMs (conversations). Others are not able to PM someone with fewer than 10 posts.
I'll just point out (not for you, since you've reached your 10 posts) for others seeking the answer, that it's not necessary to start 10 different threads over there to up the count. You can just start a thread and post on it 10 times.
Or, even, post on one of the already existing threads 10 times.
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