  The disk-outflow connection is thought to play a key role in extracting
excess angular momentum from a forming proto-star. Though jet rotation has been
observed in a few objects, no rotation of molecular outflows has been
unambiguously reported so far. We report new millimeter-interferometric
observations of the edge-on T Tauri star - disk system in the isolated Bok
globule CB26. The aim of these observations was to study the disk-outflow
relation in this 1Myr old low-mass young stellar object. The IRAM PdBI array
was used to observe 12CO(2-1) at 1.3mm in two configurations, resulting in
spectral line maps with 1.5 arcsec resolution. We use an empirical
parameterized steady-state outflow model combined with 2-D line radiative
transfer calculations and chi^2-minimization in parameter space to derive a
best-fit model and constrain parameters of the outflow. The data reveal a
previously undiscovered collimated bipolar molecular outflow of total length
~2000 AU, escaping perpendicular to the plane of the disk. We find peculiar
kinematic signatures that suggest the outflow is rotating with the same
orientation as the disk. However, we could not ultimately exclude jet
precession or two misaligned flows as possible origin of the observed peculiar
velocity field. There is indirect indication that the embedded driving source
is a binary system, which, together with the youth of the source, could provide
the clue to the observed kinematic features of the outflow. CB26 is so far the
most promising source to study the rotation of a molecular outflow. Assuming
that the outflow is rotating, we compute and compare masses, mass flux, angular
momenta, and angular momentum flux of disk and outflow and derive disk
dispersal timescales of 0.5...1 Myr, comparable to the age of the system.
