Leave a Copy of Message on Server with MAPI

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We are using Exchange 2007 Server and Outlook 2007 Clients.

We have configured this clients with the Exchange Server through the
standard Exchange-Outlook Config (MAPI).  In this case, whenever the
client does Send/Receive, all the mails get downloaded to his local PST
and the same gets wiped out from the server.

I want to configure it such that Mails get downloaded to his PST as well
as a copy is kept in the server.  How can I do this?
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Changing the Outlook settings  
 To leave messages on the server, you will:    Open the Advanced settings window for your mail account
Check the "Leave a copy of messages on the server" checkbox

From: http://support.tigertech.net/outlook-2007-lmos

Does that work?
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Commented:
Under the account settings you need to select the Mailbox in the deliver to option (it will be on the general screen when you goto Tools > Account Settings)

There is no way to deliver to both PST and Mailbox it's one or the other.  But if you have Exchange in Cached mode it will allow for the mail to be read offline.

The above post is refering to POP3 download and will not have any effect on MAPI
Rereading , I did not include the MAPI reference:  

The image should explain the ost and pst.

"In Outlook 2003, click Tools > E-Mail Accounts > View or change existing e-mail accounts > Next.  In Deliver new e-mail to the following location, make sure delivery is to the Mailbox's inbox, not personal folders.  You should never deliver Exchange-based mail to a PST for the reasons you've seen. "

"If you want mail on both the server and workstation, then offline folders and cached mode are for you.  Basically a client using cached mode has a cached copy of the mailbox in his OST file on the workstation.  It's great for remote users over slow links (raises hand) because when you click on that message with a 7GB attachment it doesn't have to download it from the server if it's already on your machine.  While Outlook is running, it'll background synchronize your inbox with the Exchange server.  Look in Outlook help for "Create an Offline Folder file (.ost)" and "Turn on or off Cached Exchange Mode".  You're also welcome to search TechNet or the Internet for cached mode and read up on how it works. "

Source: http://www.eggheadcafe.com/software/aspnet/32873854/leave-a-copy-of-message-on-server-with-mapi.aspx

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