Well, the plural of mouse is mice, therefore logically it should be computer mice. But mouses is the word that is used by people in the IT industry - both within India and abroad. So, if you walk into a store that sells computers and ask for some mice, don't be too surprised if the salesman bursts out laughing. It's also very common to hear people talking about e- mails rather than e-mail.
COURTESY : The Hindu (The National News-Paper) - India