Just for the record, Microsoft has not updated their app since Aug 21, 2013. They had access to months of preview versions of iOS 7 and all of it's updates since. Who do you think is responsible for a broken app?
Also, maybe try some basic troubleshooting steps before you rant. These issues are common after an OS update on EVERY platform, not just Apple devices.
You can try resetting your iPad by simultaneously pressing and holding the Home and Sleep/Wake buttons until you see the Apple Logo. This can take up to 15 seconds so be patient and don't release the buttons until the logo appears.
Try again to see if the problem persists.