blackberry messanger conference size

Hi does anyone know if there is a limit to the number of contacts you can have in a bb messenger conversation? I did a conversation with 4 people (trying to make plans for a dinner) and some said they were getting the messages and some weren't. One person said that their messages were posting twice on their screen, but I only saw it once. Is it cause there were to many people typing at once that the messages didn't go through? I have a bold and they all have curves...not sure if that makes a difference. Just wondering if anyone has an answer or if it has happened to anyone else. Thanks.

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Sounds like they're having problems with their phones. I've had up to 8 people in a conference on BBM.