Hi,

We're in the process of planning a migration to Exchange 2013 from a legacy 2007 system that currently has no external access for security reasons. The new system will allow ActiveSync connections for mobile devices to sync their mailboxes but I'm not sure about the steps required to provide this feature.

I've used the "Exchange Server Deployment Assistant" and can follow the steps to getting the new 2013 servers installed but am not sure if we can allow access to their 2007 mailboxes via ActiveSync from the 2013 CAS servers?

The document seems to suggest that the 2013 CAS will re-direct ActiveSync connections to the 2007 mailbox server but I'm not sure if this happens externally (in which case we'd need to "open up" the legacy servers) or internally which would be the preferred method?

Any ideas?

Cheers for now

Russell

 

You need to have two separate External URL for Exchange 2013 CAS ActiveSync and Exchange 2007 CAS ActiveSync.

Once it is configured - you need to publish both of this via your external facing load balancer, TMG whichever you use.

HTH

Abhi

Abhi,

Thanks for the reply but I think the following link shows that the ActiveSync connection to the 2013 CAS is proxied internally to the 2007 servers:-

http://blogs.technet.com/b/exchange/archive/2014/03/12/client-connectivity-in-an-exchange-2013-coexistence-environment.aspx

Cheers for now

Russell

• Marked as answer by RSBurnell Wednesday, February 11, 2015 10:56 AM

Hi Russell,

From your description, I would like to clarify the following thing:

If some ActiveSync devices can't handle the redirect correctly, you need to force ActiveSync to proxy from 2013 to 2007. In order to force a proxy scenario, the externalURL value for 2007 is set to $null. The internalURL on Exchange 2007 should be configured with https://legacy.domain.com/Microsoft-Server-ActiveSync

Hope my clarification can be helpful to you.

Best regards,

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