One of the following messages can appears when you open a schedule:

• Some files can damage your computer. If the information on the file below seems suspect, do not open or save this file.

  • This message can appear because Excel is unavailable.

• Macros may contain viruses. It is always safe to disable macros. However, if they come from a trusted source, disabling them will prevent you from accessing all of the functionality.

  The message appears when the workbook has lost its signature.