can you explain in more detail what you mean when you say the charts don't resize correctly? you can also use the "options" tab when composing a message to upload an image, if necessary.
i wasn't aware of this feature in IE7 but the charts looked OK when I tried it. the charts are just rendered as images in HTML, so i can't imagine why they would be displayed incorrectly.
you might want to check the setting of DeploymentScenario.RenderingType on the chart, as the renderer used (Image, Flash, or SVG) might have an affect here.
The DeploymentScenario.RenderingType is set to Image on the charts.
When using the Page->Zoom->50% feature on IE7, the charts do not shrink accordingly, the rest of the page does. Similarly, for Zoom to anything greater than 100%. On the contrary, in IE8 beta, the zoom feature shrinks and expands the charts correctly. I am not sure what is causing this. Many people use IE7 and if they want to zoom the page, the charts don't resize (they overlap), and this will pose as a huge problem.