As for Office2000 registration issue,
PCWorld has an article on this (its old news):
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In what Microsoft calls a volley against "illegal installations," you must register your copy of its upcoming Office 2000 Service Release using a new Registration Wizard--or the software will expire.
Office 2000, Service Release 1 will run, prompting you to register, 50 times. If you don't heed the nudge after 50 uses, the software shuts off. The restriction applies to retail (not multilicense) versions.
To avoid this conundrum, you must register the software via e-mail, phone, snail mail, or fax by sending a 16-digit code and the country in which you live to Microsoft. In return, the company will send you an eight-digit code that entitles you to install the software on up to two machines.
When you register electronically, the Registration Wizard passes an installation ID to Microsoft's server, similar to the way a Web site cookie puts identifying information on your PC. But Microsoft says its registration process doesn't identify you as a person--it just identifies your PC.
In order to get that eight-digit installation ID, the company needs an e-mail address, phone number, street address, or some way to send the code to you. Microsoft won't use that information for marketing or pass it to third parties without your consent, promises Jackie Carriker, group manager for worldwide antipiracy marketing.
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