Nokia Business Software site now lists the Blackberry Connect Client for E61 again. It was released on Monday for a brief period of time, then link was pulled out.
I checked the file from today and Monday, exact same copy. So, I wonder why they pulled the link.
You can grab it at Nokia Business Software
The client works ok, Email and Calendar sync wirelessly. The PIN messaging does not work. I tried sending a PIN message from a Blackberry device. It shows as delivered but nothing comes on