There has been widespread coverage of the striking bottom line in the latest set of accounts filed by Microsoft in Ireland – the $3 billion pre-tax profit posted by its main trading company here, Microsoft Ireland Operations, which employs over 2,000 workers at its Leopardstown campus in south Dublin. The same sum, however, emerges from the filings as a more crucial piece of information for Ireland at a time of renewed strain on the state’s coffers – the total of tax charges declared by Microsoft group companies in Ireland in the past year, too, was $3 billion. The Currency analysed…