To get MS OE installed on wine/crossover you need to install Internet explorer (I think 6 is the only one that comes close to working)
I can't remember if crossover has the IE installer, if it does then use that!
Failing that you can get the IE6 installer from;
that will give you OE fuctionality
BTW to avoid licensing woes, you must have a licensed copy of winxp as this comes with IE6, apparently if you have that then you are licensed to use it.
Hope that helps