I have Outlook 2011 running under OS 10.6.8. Time-Warner is my ISP and the e-mail is a POP account. About once every 12 months, usually in early Autumn, all my e-mail gets duplicated in each of my e-mail sub-accounts. The same thing also happened when I was using Entourage 2008 with OS 10.4.x and 10.5.x, but not with the previous Entourage 2004 ... going to Entourage 2008 seemed to be the start of this. What's going on?

I manually clean-out and delete the files, and I'm OK for another year. Note: duplicate e-mails only show-up on the Outlook POP account, but not when viewing the TW web mail from my browser.

I previously contacted Time-Warner, and they blamed Entourage / Outlook settings (but could not identify what those should be) ... ultimately, they said it was a problem for Microsoft tech support.

I contacted Microsoft tech support; they verified my Outlook settings were appropriate for a POP account. They told me it was not a Microsoft issue, rather a problem with Time-Warner e-mail servers, mostly likely associated with some reboot or system reset. Time-Warner denied this could be the cause, however, they are more Win-PC focused, and have little knowledge with the Mac version of products. For what it's worth, by wife's PC on the same account, running XP and Outlook 2007, does not have this problem.

• Is there an advanced setting within Mac Outlook 2011 to prevent this in the future?
• I have several 1000 duplicate e-mails; what is best software or Outlook plug-in to remove duplicates?

Thanks in advance for any ideas.