Batch file automated a clean-up job, then fouled itself by deleting the wrong directory

WHO, ME? Welcome to another installment of "Who, Me?" – the reader-contributed column in which The Register opens the working week with your tales of IT woe. This week, meet a reader we'll Regomize as "Pascal," who once worked for a company that had just acquired its first Exchange server, home to around 600 mailboxes. "The IT manager was keen we kept on top of the performance of the Information Store and suggested we take the box offline once a week to defrag it," Pascal told The Register