Mac Endnote XI library conversion in Office 2008

I have just recently purchased and am running an iMac with OS 10.5 software, Office 2008 and Endnote XI.  I have downloaded the Endnote XI patch for this software and am able to use it with my Word software.  I have a major Endnote library from my previous computer that, when I open it, it is empty.  This library was initially created in an earlier version of Endnote (I am uncertain of which version) but had recently been converted it to an Endnote X library (file transferred from older computer), prior to attempting to open it in Endnote XI.  I guess my question is, is Endnote XI unable to convert libraries originally constructed in a pre-Endnote 7 format but converted and saved in a post-Endnote 7 format? If not, any suggestions on how I might save this library?