IE drop down address window

Hello,

In the past when I typed in an address it was saved in the drop down from day to day. Recently, we had an upgrade to a T-1 line for our office and now when I type an address it is saved only for the time the browser is open. If I close the browser and reopen the drop down is blank. The T-1 line I am positive has nothing to do with this problem and we did not upgrade IE. Can you tell me what to do to have these frequently visited addresses saved in the drop down?

Thank you.