KB950159 and Blackberrys

July 24, 2008

I haven’t proven this definitively, but it appears that after installing the Exchange security update described in KB950159, Blackberrys that use BIS to talk to Exchange cease to communicate with Exchange because the BIS site can’t authenticate with Exchange. After specifing “https” instead of “http” in the BIS OWA URL for each user, BIS can again authenticate with Exchange. Hope this helps someone!