Hey Laura,
Unfortunately, the only way to export the topology errors is to use the Layer Properties of the Topology layer in ArcMap > Errors tab. There you have Generate summary button. After clicking this, the Export to file button is activated. This is the one you should use. You can export to a .txt file.
After you've saved this, open MS Excel. If you have 2007 (which I guess you do), go to the Data ribbon section > Get External Data (From Text) > choose the .txt file you've just saved. Choose the comma as the delimiter. This will let you get a pretty the same view of the report you see in the Errors tab in ArcMap.
Hope this works for you.