I'm in Germany but regularly travel to other countries in Europe and to US with my BB. As others have said, as long as there is some sort of International Roaming Agreement with the carrier you should not have any issues (noting that Europe is exclusively GSM, not CDMA of course).
BB works just as it does at home...email, internet, phone (ensure all the numbers are set up in the address book with international dialling codes before you go - most Europeans do this anyway). It will cost, but if the company is paying and your manager is on a business trip, who cares? If they are not on a business trip, leave the BB at home, who wants to get work emails on vacation?!
I wouldn't bother with a local SIM...it'll mean a new number if anyone wants to call them, there's the hassle of having to 'top up' the credit on a PAYG SIM, and it might not include a data plan. Not worth the pain