  We investigate the implications of a bulk rotational component of the halo
velocity distribution for MACHO mass estimates. We find that for a rotating
halo to yield a MACHO mass estimate significantly below that of the standard
spherical case, its microlensing must be highly concentrated close to the Sun.
We examine two classes of models fitting this criteria: a highly flattened
$1/r^2$ halo, and a spheroid-like population with whose density falls off as
$1/r^{3.5}$. The highly flattened $1/r^2$ models can decrease the implied
average MACHO mass only marginally and the spheroid models not at all.
Generally, rotational models cannot bring the MACHO mass implied by the current
microlensing data down to the substellar range.
