My entire MS exchange connectivity in the dump. Can't calendar and can't use Outlook 2011 since "upgrading" to El Cap. Tried removing the Exchange acct from Calendar and re-adding. Gave me options of calendar, notes, reminders, yadda yadda and selected calendar. Added it and zip, nada, nothing - not even a check box to turn off and on contents. All I get with O2011 is a bouncing ball when stuck on sync - maybe too many days at the beach dreaming up the new beach ball and not enough time in the test lab. Very disappointed in this release - so much promise yet so far away to the point almost of rolling back to yesterday.