.. or rather, for now perhaps, the "help" aspect of v6 is on the way out. If you cruise by their much loved v6 help pages at the top you will see a notice stating...

"Starting January 3rd, 2007, we will no longer offer the online help pages or customer support for Yahoo! Messenger 6.0 . Click here to upgrade to the latest version of Yahoo! Messenger, version 8.1."

all good things must end I guess... but it will be sad to see them go.

If you're a version 6 user and you're not so eager to jump to version 8 then perhaps consider taking a minor step up to version 7 or v7.5, both of which are still available for download from Yahoo! It's often best to download the last release from previous versions as it avoids prior issues since corrected... there are other versions available but below is the last for each version range of the two major version releases prior to v8...

last release of v7 was 7.0.2.120 (for Windows 98 / 2000 / ME / XP) released 23 December 05
http://us.dl1.yimg.com/download.yahoo.com/dl/msgr7/us/ymsgr702_120_us.exe

last release of v7.5 was 7.5.0.819 (for Windows 98 / 2000 / ME / XP) released 16 June 06
http://download.yahoo.com/dl/msgr75/us/ymsgr750_819_us.exe