Outlook sending duplicate emails under certain circumstances

Outlook 2007 is sending duplicate emails under the following circumstances:

- User has two accounts, one Exchange-based, the other POP -- both accounts live on the same server

- When user sends to a group and CC's 3rd-parties who are not in the group, the 3rd parties receive the dupes

- When the POP account is disabled, no one receives dupes.

Is this a client issue, or server issue?
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d4nnyoAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
It is both a client and server issue. It is caused by having two sets of accounts. Outlook sends the email and it is processed by Exchange twice because it doesn't know the difference. It is obviously detecting the duplication for internal users so they don't get a double copy.

What is the reason for having the second account in Outlook as POP3?
If it is for sending as another user then Full Mailbox and Send As with the from field deals with that - switching to Outlook 2010 would be an even better solution.

Simon.
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d4nnyoAuthor Commented:
When you say "Full Mailbox," do you mean, setting up the secondary (POP) account as an additional regular Exchange box would resolve the issue?

I agree re Outlook 2010 but those decisions are made by corporate IT, not me.
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Simon Butler (Sembee)ConsultantCommented:
If the account is POP3, then it is a full mailbox. You just need to grant Full Mailbox Access permissions to it, as well as Send As.

Simon.
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