It’s not over yet – not completely – but it might as well be. On Monday Microsoft sent out a letter to its customers dashing any hopes of a stay of execution for Windows XP.The letter (PDF) from Bill Veghte, senior vice president of the Online Services & Windows Business group, affirms that after June 30 Microsoft will suspend OEM distribution of Windows XP. The extension some people advocated isn’t happening. Good. As I’ve expressed before, Microsoft can’t get XP out of the OEM channel fast enough.But vestiges