I purchased my 036 Pro new in 2001. The dealer ordered it from Stihl, so they were still either making them or selling their back stock at that time, which was, I think, around mid summer.
Last week, a retired Stihl dealer [just retired a few months ago] claimed to me that the 036 is basically the same saw as the 361 as far as size and so forth. On the other hand, I don't personally know and others here say it isn't the same. I don't know what the MS suffix is or whether there are other "361" models as I haven't kept up since my saw does me so well I haven't bothered. Someone here will pipe up and tell us the differences, for sure, and maybe I'll catch up my knowledge.