I definitely wouldn't use it without making a good starter, probably stepping it up if it seems 'sluggish' in the first starter.
yeast is living, so it can survive some amazing stuff.
a lot varies on how it was stored and what the expiration is on the label.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10