When it comes to work, there are no friends. Keep your friendship out of it, at work be a true professional and raise your voice at whatever is wrong. Because if you wonít raise your voice today, no one will allow you to rise about your rank in the office tomorrow. Donít commit a mistake of letting your friend off the hook, if he at fault. Tomorrow same friend will make you stand in the dock in the same situation. Take my words, work comes first and then friendship. Keep both entities different, if you want a progress in your career.