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Exchange 2010 Connectivity/ BlackBerry queries

Posted on 2011-09-05
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Last Modified: 2012-05-12
Hi

We are running BES 5.1.3 with Exchange 2010 SP1. In our main site, we have an Exchange 2010 CAS array (uk-array-cas1) made up of 5 CAS servers (uk-cas1, uk-cas2....uk-cas5). We then have mailbox servers (uk-mbx1, uk-mb2...etc).


Connections to the CAS array are load balanced by a Cisco Load balancer.


Our BES servers are configured with a MAPI profile for a mailbox named uk-svc-bes5. The mailbox itself is held on uk-mbx1. If I check the BES MAPI profile on each server, I can see that they are pointing to uk-array-cas1.

I had some questions related to this connectivity.


i. Does BES actually ever access the service account mailbox itself, or does it use this mailbox for permissions to access the GAL and other people's mailboxes?

ii. Its my understand that it's the Messaging Agents (MA's) that are responsible for spawning MAPI threads to the users' mailboxes. So how does this actually work with Exchange 2010? Does each MAPI profile connect directly to uk-array-cas1, or does it somehow resolve which CAS servers are in this and have a direct connection to a CAS server? Our Cisco Load Balancer has a virtual IP, if I used a network sniffer would I expect to see a connection ot the virtual IP of the CAS or one of the component CAS servers?


iii. What if we had a BES account that was in Germany for example. That has a similar set up with germany-array-cas1 and so on. Would the MAPI connections be to germany-array-cas1, one of the German CAS servers or still the UK array/cas server and then redirection from there to somewhere else
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Question by:bruce_77
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oldhammbc earned 2000 total points
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Hello,

Was just having a look through your questions and ill try to answer them the best I can.

1. The blackberry mailbox is accessed and logged into by the blackberry service mailbox to send emails and access GAL's etc. When the bes server sends an email it sends it from its own mailbox using the "send as" permission for the actual user. (hope that makes sense)

2. Ive never used a Cisco load balancer with exchange but im guessing it will work the same as windows NLB (hopefully with lots more features to justify the cost!). The bes server acts exactly like outlook, so in exchange 2010 all connections will go through the CAS using the virtual ip of the load balancer.
The only issue ive seen with load balancing is because the blackberry server is a single source IP the traffic from it all gets sent to one cas server rather than being spread around cas servers in the array. To fix this id see if there are any settings on the load balancers regarding afinity and if there were any options other than on source ip address.

3. ive never got into this level of depth but as far as i know as log as it was in the same domain the bes server would use the closest CAS server and that server would proxy over to the cas / mailbox servers in Germany.

Hope that helps a bit!

Best Regards

Dave J
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