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Caching server for local use of an Exchange Online setup

Reece
Reece asked
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Last Modified: 2014-06-15
We're about to migrate our existing on-prem Exchange 2003 server to the cloud using Microsoft's Exchange Online.
Before we make the final decision and begin the process of migration, I have a few concerns about bandwidth use and storage.

One of the offices that currently use our on-prem server (in fact, it's the office that the server is physically located) has around 40 users on the local network.  One advantage of the on-prem setup is that any internal emails go directly to the server on the LAN and are routed to the various mailboxes... all of this without the email going www.

My question is basically, is there a way to have a Exchange Online "replication or cache" server on-prem so internal emails can continue to do what I've mentioned above?  ie. If a user sends an email to all staff with a 25MB attachment and rather than it being DL'd from the Exchange Online cloud 40 times, it is just accessed on the LAN.
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Adam FarageSr. Enterprise Architect
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Commented:
I honestly do not think this is possible, and even implementing a hybrid server this would not be possible.
AmitIT Architect
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Gareth GudgerSolution Architect
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ReeceICT Consultant
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Commented:
I have been recommended to look into Riverbed/Akamai's Steelhead Cloud Accelerator as a possible 3rd party solution.  Without me delving into thorough research on this product and weighing its costs against a better internet connection for the offices involved (eg. 10M/10M rather than ADSL2 which is 20M/1M)...  has anyone come across a 3rd party solution like this?
AmitIT Architect
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Commented:
Riverbed you can look.
Adam FarageSr. Enterprise Architect
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Commented:
RiverBed? WAN Accelerator?

Be careful with that, I have seen a client two weeks ago with a brand new riverbed that was stripping out the UUID from the Outlook Anywhere packets.. thus making the packet garbage.

We had to exclude all of Exchange and Lync from it.
ReeceICT Consultant
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Commented:
Thanks for your thoughts/tips guys.  We're going to stick with the internet connection we have for the first few months after the Exchange migration.  If there are issues, I will implement some company policy and do some staff training.
If this is still not enough, we will look into an SHDSL connection rather than ADSL.

Cheers
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