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This is a topic that is all over the internet with no real solution. I had to get to level 2 support from MSFT in order to determine the solution.
Here is the problem: when using Outlook (I use the MAC version, 2011), for GMAIL emails that are set for IMAP, duplicate copies - 2 or 3 copies - appear in the Outlook inbox. There are many different approaches to trying different settings and such on the internet, but no real solution is posted.
This issue goes hand in hand with all emails in GMAIL disappearing from the online inbox and going to the All Mail box. This happens, again, when running Entourage 2008 or Outlook 2011 for MAC with IMAP for GMAIL.
As far as I know, these two issues:
1. Emails disappearing from the online IN box for GMAIL, and appearing only in the All Mail box, and
2. Duplicate copies of emails appearing in the Entourage or Outlook IN box,
are universal issues with both PC and MAC versions of Entourage/Outlook when trying to configure for IMAP use with GMAIL.
The culprit it turns out, is not any particular setting in the GMAIL or on the Entourage/Outlook, but the RULES that people implement in Entourage/Outlook to transfer emails FROM the IMAP IN box that exists on the server and is mirrored on the Entourage/Outlook program, TO some new folder that exists on the computer itself.
Simply put, when using IMAP, at least with GMAIL, you must be satisfied with the server created online folders to store your emails. You may not use Rules within Entourage/Outlook to pull the emails to other folders on your computer, no matter how neatly organized the end result may appear. You must be satisfied with the online IMAP folders only.
SO - to avoid duplicate emails in the IN box when using IMAP for GMAIL on Entourage/Outlook, forget about rules to move around incoming emails (you may get away with transferring outgoing emails without creating the duplicates, for some bizarre reason). Just be satisfied with the online server email boxes, that will be mirrored on your Entourage/Outlook.
Here is the problem: when using Outlook (I use the MAC version, 2011), for GMAIL emails that are set for IMAP, duplicate copies - 2 or 3 copies - appear in the Outlook inbox. There are many different approaches to trying different settings and such on the internet, but no real solution is posted.
This issue goes hand in hand with all emails in GMAIL disappearing from the online inbox and going to the All Mail box. This happens, again, when running Entourage 2008 or Outlook 2011 for MAC with IMAP for GMAIL.
As far as I know, these two issues:
1. Emails disappearing from the online IN box for GMAIL, and appearing only in the All Mail box, and
2. Duplicate copies of emails appearing in the Entourage or Outlook IN box,
are universal issues with both PC and MAC versions of Entourage/Outlook when trying to configure for IMAP use with GMAIL.
The culprit it turns out, is not any particular setting in the GMAIL or on the Entourage/Outlook, but the RULES that people implement in Entourage/Outlook to transfer emails FROM the IMAP IN box that exists on the server and is mirrored on the Entourage/Outlook program, TO some new folder that exists on the computer itself.
Simply put, when using IMAP, at least with GMAIL, you must be satisfied with the server created online folders to store your emails. You may not use Rules within Entourage/Outlook to pull the emails to other folders on your computer, no matter how neatly organized the end result may appear. You must be satisfied with the online IMAP folders only.
SO - to avoid duplicate emails in the IN box when using IMAP for GMAIL on Entourage/Outlook, forget about rules to move around incoming emails (you may get away with transferring outgoing emails without creating the duplicates, for some bizarre reason). Just be satisfied with the online server email boxes, that will be mirrored on your Entourage/Outlook.