Impression share changes are coming next week. Download any desired historic reports now.

«On October 1st, we announced several improvements and changes for AdWords impression share (IS) reporting planned to happen in early November. When we launch these improvements next week, there will also be changes to the availability of historical IS reporting data.
Preserving pre-October 201…»   » source  |  + cache
 

See original post by JD Supra