  The SiliconMicro-strip Tracker (SMT) at the D{\O} experiment in the Fermilab
Tevatron collider has been operating since 2001. In 2006, an additional layer,
referred to as 'Layer 0', was installed to improve impact parameter resolution
and compensate for detector degradation due to radiation damage to the original
innermost SMT layer. The SMT detector provides valuable tracking and vertexing
information for the experiment. This contribution will highlight aspects of the
long term operation of the SMT, including the impact of the silicon readout
test-stand. Due to the full integration of the test-stand into the D{\O}
trigger framework, this test-stand provides an advantageous tool for training
of new experts and studying subtle effects in the SMT while minimizing impact
on the global data acquisition.
