Office 2003 Pictures not compatible with Office 2008 Mac

I'm using MS Office Mac 2008. Rest of company using PC/Windows and MS Office
2003. When I view corp documents (PowerPoint, Word), some of the pictures in
the document are formatted incorrectly. I don't know the source of the
picture but it is some sort of bitmap image (jpg, gif, bmp). Displays
correctly on PC and Office 2003.

When I open these files with MS Office Mac 2008, some of these pictures
display properly, but many others are zoomed/cropped. Happens with both
PowerPoint and Word. I can right click on the picture, and choose "format
picture" so Office sees it as some sort of bitmap.

For example, by zoomed/cropped... the original picture may be 1" x 2", no
background color, and exist on 2 different slides in MS PowerPoint 2003. In
Office Mac Powerpoint 2008, the picture appears correctly on 1 slide, but on
the other slide it shows just the upper/right corner of the image, expanded
to the same size, 1" x 2", and now it's pixelated with a white background.

This happens often, so it is a real hassle to have to delete the original
image and try to re-insert it. I frequently present using corp or others
ppt's and edit word documents, and this is preventing me from migrating to
all-mac

Any ideas?