  Let $G$ be a unimodular Lie group, $X$ a compact manifold with boundary, and
$M$ be the total space of a principal bundle $G\to M\to X$ so that $M$ is also
a complex manifold satisfying a local subelliptic estimate. In this work, we
show that if $G$ acts by holomorphic transformations in $M$, then the Laplacian
$\square=\bar\partial^{*}\bar\partial+\bar\partial\bar\partial^{*}$ on $M$ has
the following properties: The kernel of $\square$ restricted to the forms
$\Lambda^{p,q}$ with $q>0$ is a closed, $G$-invariant subspace in
$L^{2}(M,\Lambda^{p,q})$ of finite $G$-dimension. Secondly, we show that if
$q>0$, then the image of $\square$ contains a closed, $G$-invariant subspace of
finite codimension in $L^{2}(M,\Lambda^{p,q})$. These two properties taken
together amount to saying that $\square$ is a $G$-Fredholm operator. In similar
circumstances, the boundary Laplacian $\square_b$ has similar properties.
