Even with the general availability of Vista SP1 and XP SP3, Microsoft is still stuck gunning for Windows XP SP2 with the Windows Vista RTM "arsenal". But despite having sold in excess of 140 million licenses by the end of March 2008, Vista has failed to produce a kill, or to impact XP's install base in a manner that would have offered the latest Windows client the lion's share of the operating system market. But this is not stopping the Redmond company from beating the old drum of the superior level of security delivered by Vista in comparison to XP SP2.

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