If the installation screen for Office 2010 never even materializes in Crossover, i.e. after the installation of .NET 2.0 you get a Crossover error and the installation fails, you may be missing 32-bit libXslt. Another manifestation of this error is an "installation language not supported" error.
Crossover does not install this library by default, but it is already present on many systems.
To check, run the following command in terminal:
$ /opt/cxoffice/bin/cxdiag
the above assumes that you installed using the .deb or .rpm package. If you installed using the .bin, that command would read
$ ~/cxoffice/bin/cxdiag
Look for
[MissingLibXslt]
"Level"="Recommend"
"Title"="Missing 32bit libxslt.so.1 library"
"Description"="This library lets Windows applications perform queries and transformations on XML files."
If you see this message in the cxdiag readout, you'll need to install the 32-bit libXslt library (the specific command/method will vary depending on your linux distribution). When this is complete, your installation of Office 2010 should proceed successfully.