I spend most of my working life on customer sites sat in their IT department looking at bookshelves full of old outdated books (Exchange 5.5 anyone?) . Why don't these just get sent to recycling?
We all know that the pace of change in the modern IT world means that by the time a traditional print book is released, the content is already out of date.
Step-forward Free Microsoft EBooks.
These provide just enough information for you to get started on a new subject or version of a product, are published in a timely manner, are often written by or reviewed by Microsoft staff in the know and most importantly are my favourite price.....Free.