I am also seeing this in office 2013. However, not sure it if it eset. Using ESET SS7 on a Windows 8.1 Pro PC with 4 accounts / profiles. 2 of the accounts use Outlook.com and 1 of these is not seeing some messages when we know they have been sent as emails are duplicated to another email address. Not ruling out Outlook.com as the problem but it is a tricky one to troubleshoot.