1.   A macro virus spreads by infecting Microsoft Word or Excel documents.

2.   And since Word works with DOS, Windows and the Mac system, a macro virus could harm any of these computer types.

3.   As a result, macro viruses are now the most prevalent type.

4.   Again, macro viruses have rewritten the rules.

5.   But macro viruses are relatively easy to write, so new ones are popping up every month.

6.   But macro viruses attached to Microsoft Word and Excel documents are becoming increasingly common.

7.   But macro viruses that are attached to Microsoft Word and Excel documents are becoming increasingly common.

8.   But Wells said virus writers soon began writing macro viruses for the new version.

9.   Despite my wazzu sighting, I do not worry too much about macro viruses.

10.   Experts say macro viruses can be written for any program that uses macros.