Converting a lead to a account

Converting a lead to a account

I really like Zoho but when I convert a lead to a account it seems to lose data.

I cannot see the lead source any were when I have converted it to a account. This is important knowledge to us even though the lead is converted. 

How should I be able to do a analysis of what lead source gives the most clients etc. if this data is lost when converting a lead to a account?