To Attach Bing Maps

Go to Create a Bing Maps key and obtain a Bing Maps Key.

Create a new configuration variable named MS_RASTER_BINGMAP_KEY and put your Bing Maps Key in the New Value field.
Save the new variable, then close AECOsim Building Designer and open a new session.
Open the Raster Manager dialog and then select File > Attach > Bing Maps.
The Raster Attachments Options dialog opens.
Select the desired Bing Maps Layers type and then click Attach.
A new raster, named "Bing Maps", is attached in Raster Manager.

Tip: Once Bing Maps is attached, you can also change the layer from the Bing Maps Layers pane in the Properties dialog.

You may get a EPSG:900913 coordinate system warning: Reprojection operation performed on coordinates outside of useful range of coordinate system
This is normal as Bing Maps provides whole earth coverage and most coordinate systems are valid for only a small part of the earth.