This is a close approximation:

Red - Important - 9211131
Blue - Business - 14848376
Light green - Personal - 7722386
Light gray - Vacation - 13095635
Orange - Must Attend - 7058426
Light blue - Travel Required - 16314511
Tan - Needs Preparation - 9292237
Purple - Birthday - 16358861
Dark green - Anniversary - 13224340
Yellow - Phone Call - 7464955