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Microsoft, Exchange, 2003, OMA and OWA data flow

Posted on 2008-10-07
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Last Modified: 2008-11-16
What is the flow of data from a PDA to the backend server? What is the flow of data when the PDA is synchronizing new email? What is the flow of data when an email with an attachment is sent from a PDA to multiple users in the same domain but possibly on a different mail server?
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Question by:OnTracIT
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by:ATIG
ATIG earned 80 total points
ID: 22670131
So that is a bunch of differnt questions......

If you are using Active Sync and you should be for mobile users its something like this...

AS does not use true direct push (depends on what version of win mob)--

So user recieves a new message the system sends a "tickle" to the device and the device inisitates a pull via https from the Ex server

from the device to the server it does not matter with the recipients.... once the server get it with 2003 it depends if the user is on the same database/store the message does not leave the store. If different servers or stores the message gets routed to the appropriate place

http://technet.microsoft.com/en-us/exchange/bb288524.aspx
http://technet.microsoft.com/en-us/library/bb124307(EXCHG.65).aspx - connectivity


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by:OnTracIT
ID: 22712244
All of our mobile devices use Active Sync and are set not to download attachments. We see a lot of OWA traffic from our Back End servers to our Front End server and can only assume that the traffic is attachments that are being sent from the Back End server to the Front End server to fulfill requests for new messages from the mobile device.

Being that the devices do not download attachments unless it is done manually, is there a way to stop the attachment from being transmitted from the remote Back End to the Front End until the request to download the attachment is made?
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OnTracIT earned 0 total points
ID: 22933840
Mailboxes on backend servers with attached mobile devices will send the entire message, including the attachment, to the front end server to be sent to the mobile device. The front end server then decides if the attachment is sent to the device. If the device is set not to download attachments or to download only headers, the remaining portion of the message/attachment are dropped at the front end server.

There is currently no way to modify this behavior.
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