Password Problem

Passwords are integral to computer security. A computer system has an offer for its users to change their passwords. They must comply with the new rule the system has set for them. Their rule though quite simple, allows only a restricted few to continue having access to the system. The restrictions while changing the password are nothing but that the password has to be of six to eight characters and should be made of an uppercase letter or a digit from 0-9. Each password must contain at least one digit. Now, tell me , how many people can continue to use this computer system?

Details and Assumptions- Each person can use only one password. Repetitions are allowed in the password.

Note- Yes, the answer is quite large. So calculators are allowed. Cheers!

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