Considering Office 365 ranges from a very simple mailbox, up to Office 2010 Pro, Lync, Sharepoint and Exchange with Forefront (and includes on premise CAL's for those products so you can federate with a local server), which version is it exactly that you're bashing Cantennas?
Did you not read what the Office Web Apps element of Office 365 was/wasn't capable of?
Reading not your strong point?
Just accept, that Microsoft's Office is a great productivity tool for the majority of office work and that the accompanying tools make the management of that office work simpler too.
The fact that you can now get all this as a managed service from the publisher is an absolute win for any small business that was previously relying on Small Business Server and that's just for starters.
If you're in charge of purchasing 7.5 million units of anything, don't you think you made some real research first? I guess you just can't stomach that Microsoft's offering might in fact be the best option. But then that's why you're not in charge of purchasing 7.5 million units of anything isn't it?
As for vendor lock-in, how exactly?
It's a subscription service you dullard.
More tired old Microsoft bashing.
You show me a more integrated elegant office productivity solution that's available as a managed service by subscription at that price point, Go on, I double dare you.