Just to add on a little to David's excellent answer ..
If you want to run through the past threads (albeit on-line), one way is to
start at Google's: "About microsoft.public.excel.misc " page (for example).
You'll find detailed summaries, monthly figures stretching back almost 10
years, a host of interesting stats (live) & a lot of clickable links
available. For instance, all the monthly figures within the "Archive"
section are clickable, and you can access and read all past threads at your
leisure ..
The Google page for this newsgroup and for some other Excel newsgroups (not
exhaustive) are listed below.
microsoft.public.excel.misc
http://tinyurl.com/7zoyq
microsoft.public.excel.worksheet.functions
http://tinyurl.com/8worf
microsoft.public.excel.newusers
http://tinyurl.com/awda9
microsoft.public.excel
http://tinyurl.com/an9dj
microsoft.public.excel.programming
http://tinyurl.com/dqdg6