To use Bing Maps in Bentley Map V8i, you need a key from https://www.bingmapsportal.com/ to your application.
Once you've received your unique key, define the variable MS_RASTER_BINGMAP_KEY = Your_Bing_Map_Key.
You can then use Raster Manager to attach the Bing Map to the design.
OpenCities Map CONNECT Edition (MicroStation Update 7 and newer) does not require a Bing Map key. You can attach Bing Maps as a raster reference or as a background image via the View Attributes dialog. To do this, the model must have a geographic coordinate system attached.