Now I am sharing my working experience with Microsoft outlook 2007. This is a very good software for accessing mails. There is a big difference between outlook and ( gmail, yahoo etc) . We can access easily mails in outlook.
Also we can find old mails easily. In outlook we can add more than one account for accessing our mails. We can make different folders and can put any special catagory mails to that folder for easy accessing. So outlook is very usable software for accessing our mails.