I have a very complicated folder structure that I need to update yearly. 2011 folder had 12 folders within for each month. Within each month can be up to 6 more folders w/files.In order to create 2012, I opened windows explorer under Actions within the sharepoint library in the 2011 doc lib and copied the whole structure over to the 2012 folder I'd just created. Then I deleted all the files in 2012 so that I had a new folder structure w/no files.
Whoever, when I looked in the 2011 folder year, all the FILES within had changed from 'modified by' someone else to my name. What happened? I'm not a contributor. I realize that the 2012 parent folder and all folders within would have my name as modifier but why did the old folders 'modified by' change? What did I do wrong?