Terms like OE or OEM have no set meaning.
I have had 3 windshields on the Box in the 7 plus years that I have owned it.
Thank god the windshield is not a mirror.
http://www.renntech.org/forums/index.php?showtopic=10360
I have watched several other 996/986 windshield replacements. There is no magic. It is just like any other glued-in windshield.
Ronzi's story is funny, and true. The older guys use a long handled tool thing with a blade on the end to cut the glue at the bottom. I have seen it done this way. This makes owners nervous, more so when you have an expensive leather dash like I do.
I told the installer this story when I saw him reach for a modern version of this tool thing, so he switched to a piano wire thing that cuts the glue without a blade. This ended up taking forever so I told him to use the blade. All went well.
I had never used this shop before. All I can tell you for sure is that they had done at least 1 Boxster - mine.
Picture is cutting the glue at the top and sides with yet another tool, but it will not do the bottom or bottom corners.