Hi All my family have Blackberry phones, I am the only one with iPhone at home, so I am wondering if there a Messenger to be used on Mac to contact my family.
There isn't quite BBM for Mac/iPhone, as the PIN system is proprietary to BlackBerry. However, there is PINGchat and WhatsApp for both BlackBerry AND iPhone. These are similar systems for device to device chatting, and you can install either of these on your family's phones and your iPHone, and you can chat
However instead of creating yet another userid/pw account for yet another tool; why not use the standards MSN/AIM or Yahoo IM as any of these are available on the BlackBerry platform.