Being able to master Microsoft Office suite could really help in bringing up productivity. But taking courses to become an expert means spending a load of hard earn cash. It is worth it but why spend when you can get it for free. The only thing you need to do is to be persistent in learning it on your own. To some people that might be quite hard (me included) but it will be satisfying when you achieve it.
Now to get these free Microsoft Office training manuals you can go to The Mouse Training Company. They are experts in Microsoft Office training. They also provide courses for Adobe and Apple. The manuals are download-able in .pdf format.
They provide quick learning reference manuals for Microsoft Office 2010 and full manuals for Microsoft Office 2007 until as further down as Microsoft Office 2000. Who still uses Microsoft Office 2000? Get the free Microsoft Office training manuals now.
Even if you are knowledgeable in the Office suite, there still might be a few surprises in the manuals that can increase your productivity. There's nothing to lose.