I have installed a trial version of Exchange Reporter Plus, at the moment the report I am most interested in is "Inactive Distribution Lists" report. 

The scheduled maintenance tasks have taken place and the message tracking logs have been imported (the tracking logs go back for 90 days). 

We have 291 distribution lists of which 229 are appearing in "Inactive Distribution Lists" does this mean the 229 have not had an email sent to them in the last 90 days? 

Thank you