Back in September I posted an article about a problem that occurred when synchronizing iOS 7 devices against Exchange 2010 SP2. The wheels of justice grind slowly, but Microsoft has released a KB article and accompanying hotfix that describe the symptoms precisely.
I also got an odd report from a large enterprise customer; they had several hundred iOS 7.0.2 devices, all on Verizon in one specific region, that were having synchronization problems. The issue here turned out to be a network configuration issue on Verizon’s network that required some action from them to fix.
Now you’re probably starting to see the value in solutions like those from BoxTone…
Paul's Down-Home Page 
So is it just par for the course now that whenever there’s an iOS update, there’s going to be an Exchange sync problem somewhere? Gag.
That’s the way I’m betting.
You may want to check our free ActiveSync diagnostic and health monitoring service at http://www.activesyncdr.com. It will help you to diagnose ActiveSync problems, monitor the health of your ActiveSync servers as well as help you optimize your environment.