I contribute only to articles on Microsoft or Microsoft products.
Notice: I no longer contribute to Wikipedia as it is based on a flawed model of bureaucracy, politics, non-accountability, insistence on citations rather than the truth, inaccuracy, bias, conflicts of interest, vandals, abuse, harassment and disrespect to its community. I *may* still contribute once in a while but only because my passion for Microsoft products, at times, exceeds my hatred and annoyances with Wikipedia. Sadly, the quality of articles I once contributed to has degraded to shockingly bad levels. - xpclient Talk Edits
I tried to wait for a long time and see if the contributors who end up reducing the article quality would go away but they persist.
See my contribs. Contribs from IPs 221.128.x.x, 202.149.x.x, 111.125.x.x and 183.87.x.x minus the vandals are me (for a certain period I only used my user ID for creating new articles or redirects so that vandals don't specifically target your contribs). Eventually, I started contributing using my username.
See my former watchlist.