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Several backward and forward incompatibilities exist between .NET 1.0, .NET 1.1, and .NET 2.0. These are well-documented and frustrate both end users and developers alike. Microsoft claims to resolve this by allowing the running of different versions side-by-side. Rather than making .NET fully backwards compatible, people just need to have EVERY VERSION of Microsoft .NET all installed at once.Succeeding versions of .NET lock out older operating systems. For example, .NET v.3.0 and above excludes Windows 2000 and prior versions, as well as XP SP1. This can be construed as a way by Microsoft to move away from previous versions, and force operating system purchases.Succeeding versions of .NET lock out older operating systems. For example, .NET v.3.0 and above excludes Windows 2000 and prior versions, as well as XP SP1. This can be construed as a way by Microsoft to move away from previous versions, and force operating system purchases. The new model is extensively tied to the Microsoft Windows operating system.