.NET Framework 1.0: Mainstream support ends 30/06/2007, extended support ends 30/06/2009.
.NET Framework 1.1: 30/09/2008 and 30/09/2010 respectively. Since .NET 1.1 is a component of Windows Server 2003, extended support for .NET 1.1 on Server 2003 will run out when the OS does, currently 30/06/2013.
I can't see any statistics for .NET Compact Framework 1.0. I would hope that it will be the same as for .NET Framework 1.1 since they both shipped with VS.NET 2003. Right now
VS.NET 2003 is showing 30/09/2008 and 30/09/2013.
There's really no hurry unless you want to take advantage of new features.
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