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Black Monday — when everyone is supposed to logon to cyberspace and click “checkout” — was a big day. Big enough that it crashed Yahoo’s system. Sounds like the World Series, and then some.

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Yahoo apologises for Black Monday fiasco

Yahoo is attempting to placate members of its Small Business Merchant programme after an outage left many sellers unable to process orders on the busiest online shopping day of the year.

The programme allows users to set up and maintain online stores and process payments.

But problems began at 6am US Pacific time when Yahoo said that systems which power the service went down.

As a result, merchants were unable to process orders and users were unable to make purchases.

Yahoo had restored the service by 1pm, but transactions remained slow to process. The service was not up to normal speed until 12 hours after the outage.