There’s been a recent event with the latest IOS 6.1 Upgrade in which customers that use Microsoft email and calendar services are unknowingly flooding their corporate servers with unwanted data. This is is a known bug and Apple is working on the issue. An event warning has been issued suggesting that customers that use Microsoft services not upgrade to IOS 6.1. IT departments may also want to block IOS 6.1 users until a fix has been issued.