I use mine everyday for business. I can’t believe how much more productive I am with it. There’s exchange support native, but if you need more features then the stock app there are plenty of alternatives. You can conference call, but I’m not sure about “pinning.” I never had a BB device. I set up plenty and troubleshot many, but never owned one.
If you need more then 3 on a call there are several good "free" conference call sites that you can set up calls with regular phone numbers instead of 800 numbers. At this point, who does not have an unlimited talk plan on their landline?
Anything the phone can’t do natively, you can usually find an App for it.
The built in Nav is a real plus and it works well enough that I gave my Garmin to my wife. The browser really works and you can actually navigate and read the sites you need while out of the office. Most of the work apps I have are tech related, and I downloaded most of them thinking "That might come in handy," but I use them all the time because they save so much time.