Maybe you need an extra driver
With Sony ereaders you need to install extra driver software before the reader can be seen from ADE; even though the computer can see it without the driver.
The driver software is installed along with Sony Reader software; no need to run the Sony Reader software itself.
There are bugs in ADE2.0 that stop it seeing some eReaders. You could try installing v1.7.2 and see if that helps.
(You can have both 1.7.2 and 2.0 installed at the same time).
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
http://helpx.adobe.com/digital-editions/kb/cant-install-digital-editio ns.html
The forum software is sometimes corrupting the link above. There shouldn't be a blank in 'editio ns.html'. The following redirects to the same page: http://tinyurl.com/diged172
Try googling 'icarus ereader adobe digital editions'. There are a few hits under 'faq.icarusreader.com', but unforunately they are broken at the moment.
I don't know if that is a permament issue or just for now.