Goodbye 32-bits. Sometime next year, Microsoft will release a 64-bit only version of its popular Exchange messaging server software, but has no plans to upgrade the current 32-bit version which will continue to be supported.
It's a bit of a risk for the software giant, given the 64-bit x86 market is only around two years old, but growing very fast. According to market research firm IDC, 64-bit x86-based systems accounted for 78.8 percent of all x86 servers sold in the first quarter of this year, with factory revenue for x86-64 systems more than doubling year over year. However, there's a catch: most if not all those 64-bit x86 servers that have been sold in the past year are running a 32-bit version of Windows.
Source : http://www.internetnews.com/ent-news/article.php/3617791