Hewlett-Packard Co. has been placed on CreditWatch with negative implications. Its future debt structure is unclear following announced moves to explore alternatives for its Personal Systems Group and to acquire Autonomy Corp. PLC. Standard&Poor's Ratings Services said today that it placed its 'A' corporate credit rating and senior unsecured rating and its 'A-1' short-term rating on Palo Alto, Calif.-based Hewlett-Packard Co. (HP) and its subsidiaries on CreditWatch with negative implications. Standard&Poor's Ratings Services said today that it placed its 'A' corporate credit rating and senior unsecured rating and its 'A-1' short-term rating on Palo Alto, Calif.-based Hewlett-Packard Co. (HP) and its subsidiaries on CreditWatch with negative implications. (Watch the related CreditMatters TV segment, "Why Standard&