Yahoo, and Hotmail provide an option to save users important contacts safely. To manage contacts from different email accounts, you can simply import them to Outlook. However, during the process any kind of corruption occurs, you can fix it with a professional tool like ...
Set Expires header with what you feel comfortable (since you cannot rename it if you decide to change it). You can probably safely set the Expires header a few months in the future. You can check the last modified date of your current favicon.ico to make an informed decision. Imagemagick...