True. A macro virus is a virus that is written in a macro language: a programming language which is embedded inside a software application (e.g., word processors and spreadsheet applications). Some applications, such as Microsoft Office, Excel, Power point allow macro programs to be embedded in documents such that the macros are run automatically when the document is opened, and this provides a distinct mechanism by which malicious computer instructions can spread. This is one reason it can be dangerous to open unexpected attachments in e-mails. Many antivirus programs can detect macro viruses, however they are still difficult to detect and its spread from the network. EDIT: I am not sure the answer is correct. "Macro viruses can affect different platforms". is it possible to run the same marco on windows and linux?