Exchange vs infrastructure

Hi Experts

Exchange 2013 build 1044.25, Server 2012 R2

We are currently running 4 exchange servers.  2 at our main corp and 2 offsite in another state.  The two servers at each location is a CAS and Mailbox server.  should the one site go down the other picks up.  

our users are experiencing latency when connecting to their mailboxes.  Now these users are in a remote location near the corporate office and are connected to our MPLS network.  The client machines are using Outlook 2013, additionally these users search their mailboxes to retrieve older documents that are 4-10 MB (megabytes) in size.  They scan their docs to email and then send them to their respective clients.

I don't see any issues with our exchange environment and want to ask if there is anything that we can do to improve performance for the end user.
johnkesoglouAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Make sure that your remote site experiencing the latency issues has it subnet added to the proper AD Site within Active Directory Sites and Services. If your users are authenticating against a DC that is geographically far away this could defintely be causing the latency issue.

Will.

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Amit KumarCommented:
check MPLS bandwidth is it over utilized as users are access 4/10 MB files it is possible and depends how many users are concurrent when they access such size of mails.

Also monitor network performance of Exchange servers, to isolate Exchange server issue you can configure multiple users in local net then try to access same size of mails.
AmitIT ArchitectCommented:
I am not clear, how site 2 picks up? What steps are you following. What do you mean by Site 1 goes down?
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johnkesoglouAuthor Commented:
amit - my comment is should the site (where the exchange servers reside) everything would fail over tot he other-site.  the comments in the first paragraph is to explain the environment and not the problem at hand.  hope this helps.
johnkesoglouAuthor Commented:
amit Kumar - we are having ATT check the MPLS link to the site for saturation.  

the office is about 20 people which is why this is such a puzzle for me....
AmitIT ArchitectCommented:
Run Netmon tool on client end and then analyze the data. You will find how traffic is routing.
johnkesoglouAuthor Commented:
thank you all for your comments, they were helpful
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