I just use the
Help => Getting Started Manual in X2. I don't care much for an "online" manual, but you can choose to make it offline, like X1 had. Comes with TOC, Search, and Index.
To equate the way things have gone to save paper, and reduce printing and shipping costs (primary reasons to exclude a printed manual), I recall a time in the late 80's or early 90's when my Dad bought some CAD software, or something like that which came in a box that was 8"x10" and 7" thick! It had six manuals, all at the very least 200-500 pages, one of them had nearly 1,000 pages. I would estimate these totaled about 2,500+ pages. The software came on two (2) floppy disks (1.4M EACH)!! You can download that software in less than a second on many modern Internet connections, and carry it around like a Word document.
In today's terms, packaging software like that may cost $20-$30 per unit to print (including packaging and print materials/ink, $1 assembly, $5 shipping. That's nothing when you see the cost of the software itself, but it is a reason to exclude printed documentation. I love the paper manuals, too, though, and I really was impressed at the package my Dad bought above. Paying for software in a substantial package like that made you feel smarter just opening the box!