If you spend a lot of time replying to your customers' email requests, you know all too well how important it is to track how much time has passed since each request was received, its current processing status (not yet read/answered/requires additional consultation), who is involved in providing a response, and of having a complete list of requests from the same customer for reference.
Experience shows that using a regular email client (e.g., Outlook, Thunderbird, Gmail) does not give the whole picture quickly nor in a convenient way. It has been proven that providing high-quality customer support is only possible using special software — we recommend our iKode helpdesk software. iKode Help Desk Software is a full featured, professional customer support software designed by iKode. Here to download the free trial here!

http://www.phphelpdesk.org/download/