Good news and bad news from Microsoft. First up, the launch of Office for iPad, a product that has been rumoured for years. It's also free, which only adds to the merriment. So how is Microsoft making money? Simple, you have to sign up to Office 365.That's the catch. It's a pretty big catch too. Microsoft unveiled Office for Apple's tablet late yesterday and overnight, offered it for free on iTunes. Which means you can go and download it right now.If you do, you'll find much that should appeal for productive or business types. The suite of software contains separate apps for Word, PowerPoint and Excel, with the option to link up to OneDrive or SharePoint to save documents in the cloud. This is all about remote working, although you can save locally if you have to.It isn't just a port, each app has been redesigned from the ground up for the tablet format, although much of the functionality and the look will be familiar to season's Office workers. If you need to makes some changes to that last minute presentation, it might well become pretty essential.But the free app does comes with charges along the way. If you just want to view documents and presentations, you can get away with keeping it free. But if you are planning on creating or editing documents, then you are looking at an Office 365 subscription, which in turn is either £7.99 per month or £79.99 per year.Ok, that does give you use of other versions of Office too. But it's still a pricey option for anyone not intent on using the app (or apps) daily.