It was perhaps one of the most drawn-out, painful launches in Intel’s long history: the introduction last February of Tukwila, the latest generation of its Itanium 64-bit processor architecture. Not everyone in the Itanium Solutions Alliance hung on for the five-year ride, with Unisys having been its most prominent drop-out last year, citing competitor HP’s dominance in the field. Microsoft held on for the entire stretch; but last week, the company announced it would not lend its support to whatever the generation after Tukwila might become.