It recently reported that 70 percent of its 156 mission-critical systems are now compliant.

CNN: USPS can't promise mail delivery won't encounter Y2K bugs

Some industries such as banking are fairly well along in making computer systems year-2000 compliant, but others, including food processing, agriculture and farming, some government services, construction, law, and medical practice are lagging, Marcoccio said.

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Hongkong Bank, for example, began making its systems "Year 2000-compliant" in the mid-1980s.

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Horn said that among all federal agencies it is particularly important USPS be Year 2000-compliant because many federal agencies and businesses plan to use hand-delivered mail in case electronic systems fail.

CNN: USPS can't promise mail delivery won't encounter Y2K bugs