Safe to Open

The SANS @Risk Consensus Security Vulnerability Alert report for this week begins “Microsoft Office documents suddenly stopped being “safe to open” last week.” This is in regards to Microsoft’s patch for Excel.
The question I would ask is dont you have to first be considered ‘safe to open’ before you can stop being safe to open? I haven’t considered Office documents safe since Macro viruses became prevelent.
I guess you companies who rely on blocking “dangerous” file types instead of having a good antivirus service like Message Labs are going to have to start blocking all excel documents the way you block Access documents.