When users open certain emails in their mailbox they receive the error "there is not enough memory or disk space to complete the operation". The only choice is to click OK and then the email opens without issue. The issue only started occurring when we migrated from Exchange 2010 to Exchange 2013. The migration logs show no errors or skipped items. There are no events logged to either the Exchange 2013 server or Windows 7 PC when the error occurs. We are able to reproduce the issue in a new Outlook profile with or without cached mode. Also, can reproduce the issue on a new Windows 7 PC that is only running Outlook 2010. All available Office and Outlook 2010 updates from MS update have been applied as of 2/11/15. The problematic emails open fine in OWA.