If anyone can't get the Email app to read mail from a Microsoft Exchange server I've found the reason (well, one reason).
To read mail from Exchange you need to have the master synch enabled i.e. the second from right icon on the power bar. I normally disable this to save the battery, and with the sync off you can create the account and it will connect but the email app sits there saying "Waiting for sync" or something like that. To get it to work I enabled the sync then removed the mail account and recreated it.
This looks like a Jelly Bean thing because by Nexus phone did the same after the OTA update. I've used Exchange mail with every previous version of Android from 2.2 upwards and Jelly Bean is the first version that's done this.
To read mail from Exchange you need to have the master synch enabled i.e. the second from right icon on the power bar. I normally disable this to save the battery, and with the sync off you can create the account and it will connect but the email app sits there saying "Waiting for sync" or something like that. To get it to work I enabled the sync then removed the mail account and recreated it.
This looks like a Jelly Bean thing because by Nexus phone did the same after the OTA update. I've used Exchange mail with every previous version of Android from 2.2 upwards and Jelly Bean is the first version that's done this.