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Japanese bank Sumitomo Mitsui has bought six Unisys ES7000 Windows servers to handle part of the task of processing automated teller machine transactions, Unisys said Wednesday. The systems, using the Windows 2000 Datacenter operating system and SQL Server 2000 Enterprise Edition database software from Microsoft, are used to merge Sumitomo's ATM networks with those of another bank it acquired, Sakura. The system handles as many as 100 ATM transactions per second, sending messages from the two bank ATM networks to a single mainframe. The setup requires the ES7000 systems to be up and running 99.999 percent of the time and, in the event of failure, for a backup system to take over within a minute.