Yes MS has invoicing templates, however you'd have to create a database for tracking purposes. If you run a business its usally a good idea to have some sort of tracking software that keeps everything in chronicial order in cause of an aduit down the line and not only that business accounting software makes it easier to balance your books at the end of the month and also to track where your money goes and how its being spent and gross/net profits ect....ya get the idea.
Any business you run its usally a very good idea to use an accounting package to keep track of everything.
Unless of course you want to do it the old fashioned way, MANUALLY!! now that is a pain in the rump if you ask me.
NeoStar