MS Access 2000 or even Excel are suitable for client management once you decide what data you need to keep eg, name, email, item purchased, date, cost, so on. No doubt you are doing that now.
Either the database or Excel will allow merges into email, envelopes, or letters, so keep the one that is easiest for you to use. What you need to avoid is data redundancy ie, entering the same data twice. If you have lists produced automatically from forms on your site and the data you have are sufficient, don't worry about reentering into your database/spreadsheet.
I use an Electronic Records program provided free by the Australian Taxation Office which can be downloaded from the ATO site at http://www.ato.gov.au
. It is a cash accounting system so when I receive a cheque from a client by mail, or a cheque from Clickbank, I can bank it and then enter in my cash receipts journal how much it was in Australian currency. As I need to account for and report Goods and Services Tax, that program is superb because it does all the calculations for me. If you aren't paying and receiving GST, it's still a handy program because it gives you cash flow and other reports that summarise your business activities any time you like.
Perhaps what you need to do Joe is decide what programs you are going to use and just do it. If you find you need to change later, you can do that too.
Desert Wave Enterprises
Your Online Performance Support
Alice Springs NT 0871