There is no way to make it work!!!
I am desperated. A couple of days after installing JB 4.1.1 the automatic official update from Google, the Exchange email account suddenly gave up working. After deleting and recreating several times the account the email still could not be synchronized. I configure everything in automatic option but it does not work. I delete the port number and leave it blank but it does not work.
I always get the same error inside the Exchange application with emails previously synchronized, that the application cannot connect to the server but the server is up and running and the configuration is correct. When I delete the accound and recreate once more again and open Exchange app it remains long long time waiting for sync, but it never syncs.
Sometimes when trying to tweak the configuration I get the system message that the account is not found.
It drives me crazy. After trying everything explained above several times I finally succeed to synchronize by activating the general sync button in the main desktop applet (the one for Energy saving which has GPS, WiFi, screen light level, Sync and Bluetooth) and waiting for the system to ask me for reactivating the Security - Device Manager options to allow the security policy specified by the email server.
Do I have to set always the general sync button on?. It will drain the battery, won't it?. Why suddenly it looses the connection and I have to make all this mess to recoup the connection to Exchange server and sync again my corporate email?