I assume that you use either Netscape or Microsoft Internet Explorer (MSIE) as a mail program, and that you have at your disposal either Microsoft Excel, or some other spreadsheet program such as provided by Corel or StarOffice.
The difference between these two kinds of software is important because a program such as Excel is a general purpose spreadsheet and thus to use it, you must explicitly specify all the rows and columns and what they are used for. On the other hand, a program such as Microsoft Outlook (Contacts) or the Address Book of Netscape are really database programs with predefined fields (such as FirstName, LastName, Address), where you enter the appropriate information.
If you have a choice, it is almost always better to start an Address Book with a database program such as Netscape or Microsoft Outlook. The reason is that these programs are specifically designed for capturing such information and typically offer quite a number of useful features such as sorting and selection. Though such features can be accomplished with spreadsheet programs such as Excel, you must generally be a more advanced user.
For example, below, is a typical Outlook dialogue box for adding contact information:
and if I click on the Details tab, I get the following:
and in the expanded version:
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