Silverlight 4 to launch April 13.

Microsoft execs said last month that the final version of Silverlight 4 would be available in April. It looks like the “launch” date is April 13, though as of April 7, company execs weren’t ready to promise that’s when final code will be available.

An aside: In Microsoft’s world, “launches” are not necessarily simultaneous with “release to manufacturing” and/or “release to the Web.” Sometimes launches follow RTM (as will be the case with Office 2010) and sometimes they precede the RTM/RTW.

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