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In this sequel to [L-Y1], [L-L-S-Y], and [L-Y2]  (respectively arXiv:0709.1515 [math.AG], arXiv:0809.2121 [math.AG], andarXiv:0901.0342 [math.AG]), we study a D-brane probe on a conifold from theviewpoint of the Azumaya structure on D-branes and toric geometry. The detailsof how deformations and resolutions of the standard toric conifold $Y$ can beobtained via morphisms from Azumaya points are given. This should be comparedwith the quantum-field-theoretic/D-brany picture of deformations andresolutions of a conifold via a D-brane probe sitting at the conifoldsingularity in the work of Klebanov and Witten [K-W] (arXiv:hep-th/9807080) andKlebanov and Strasser [K-S] (arXiv:hep-th/0007191). A comparison withresolutions via noncommutative desingularizations is given in the end.

Azumaya structure on D-branes and deformations and resolutions of a conifold revisited: Klebanov-Strassler-Witten vs. Polchinski-Grothendieck