From what i can remember i think Morrowind + Xpaks had well over 400 quests and Oblivion +DLCs+ SI had well over 200 quests. Don't quote me on that, I could be wrong,
Yes, that's correct - IIRC Morrowind GOTY had over 400 quests and Oblivion GOTY around 250 or so.
In the bulletproof pixel radio interview, Pete mentioned that Skyrim has around "6 or 7 times the number of quests in FO3" (around 32 quests), so my guess is so somewhere around 200 - 220 quests without DLC.