The "old" namespace is a collection of pages imported from our previous mediawiki wiki. Use these pages as a last resort if you can't find anything in the main wiki.
As pages get checked and we are confident there is no longer a need for these old versions, they will be deleted. You can still access the old versions by adding &do=revisions to the page name in the URL. The deleted pages are listed here.
Old wiki pages
Deleted Wiki Pages
Click the links below to access the revision history. Otherwise do a search to find the up-to-date information in the main area of the wiki.