Running the Public Beta (that's all I have access to). I am unable to sync my Exchange account with Mail.app without it crashing. I've tried all of the steps to remove all preferences and existing mail cache/stores, repaired the disc, repaired permissions, but all to no avail. Essentially, I will add my Exchange account (a hosted Exchange 2010), which will begin to download all of the many folders and emails (it's about a 10gb mailbox, so quite large). It goes for about a minute or so before the app just shuts down. I've tested whether clicking on an email (to view it) will affect this but it crashes regardless of any interaction from launching of the app. I've submitted this via the Feedback App multiple times now but since the Beta hasn't been updated, I don't know if this will be fixed. The short version of the crash log is basically saying: (I can post more if anyone wants, but figured this is the most relevant part) Anyone else having this issue? Haven't found anything online from anyone else, so I'm not sure if this is just me (and a problem with my hosted Exchange account, which works fine in Outlook 2011, FWIW).