1. Word has an "Address Book" command that allows you to save and re-use
addresses as long as your system has a suitable piece of Address Book
software. You can enable it using Tools|Customize (and you will probably
find it in the category "All Commands") to drag the option to a menu or
toolbar.

Unfortunately this option does nto work with the most commonly available
Address Book software which is Outlook Express (OE) - nor can you usually
drag-and-drop from the OE address book since it inserts more data than you
need. It can wok quite well with the full Outlook.

2. However, if the number of addresses you maintain is small enough, I would
just create a Word document called "addresses" and store them in there in
exactly the format you want to use them. Anything else just adds
complication which may be unnecessary.