>I was wondering if anybody here has implemented Address Verifications and can make a recommendation ?
>
>I have done some research and have found out our possible options are;
>
>- Purchase Online Database Service and pay per use (for all customers who signup).
>
>- Buy the Data (on regular basis because of frequent updates) and install it on our own Server.
>Customer station will call our Server online. No Pay Per Use fees. But instead need to pay for the Data and Server Maintenance.
>
>- Customer buys the CD for each station (on regular basis), installs it, and then our App does a "LOCAL" call via DDE / DLLs.
>(nothing online - No Pay Per Use fees, no costs on our part - customer buys updates directly from the Data Vendor).
>
>Would appreciate any inputs.
>
>Thanks.

I guess it partly depends on the volume of verifications required.

If all of your customers who require the verification servce have internet connections I'd go for option one - keeping a local copy of a large database updated regularly is a pain.
Alternatively could you code to allow customers to choose between the first and third options?

In my experience any data provider is going to make a *very* steep charge for the use of data as in option 2 - if they allow it at all. You would essentially be buying one copy of the data from them but distributing to a potentially unlimited number of users (aka their potential customers)