Update 2/17/2018 - From what I have found out, Carter Page's surveillance started in October 2016. It was renewed 3 times for 3 months each so unless it was renewed unknown to us, the surveillance ended in October 2017. So if he was not currently under surveillance when the memo came out, they would claim that no unmasking took place. I still wonder if finding out anyone was under surveillance so close to the ending of the surveillance was damaging, but technically, it is not unmasking.
One thing that has not been addressed with the release of the "Carter Page" memo, is that in unmasking Carter Page as the person who was being surveilled, this ended any information that was forthcoming from the surveillance. Now, it might be that the information was already winding down, or that his identification was out there to the point that the information being gathered was not longer trustworthy; in fact could have been already been purposely misleading. The fact is, now that Carter Page has been "unmasked", no more information will be coming from this investigation.
