Question: how does yahoo manage to handle all those subscribers registered to them?i think these addresses are too many! 

Answer: Yes they are of course too many and it is really not easy to handle all of them. As a result, there are some tricky things to be done. For example, they use overlapping in terms of allocating the discspace. Suppose there are 10,000,000 users and it is really not that all of them are using all of their 1GB mailing space and the 30 MB of briefcase space and the unlimited space for photo albums and so for other YAHOO! Services. YAHOO! is allocating the necessary spaces only and when you are not using the full space allocating for you, the space will automatically be used by other users. Thus the need for the big wastage of storage gets reduced.
This question from the Yahoo Q&A forum is categorized in the topic: Sports