Exch 2k3 and BOIS

Andy C · Joined: 25 Aug 2007 Posts: 1

I am currently setting up a new Branch Office, and I am curious as to the
need of having an exchange server at the remote site. They will be on the
same domain (AD and DNS) so all the mail must come through HQ. I was
thinking that Outlook Cached mode on the clients would allow me the ability
to keep the exchange server at HQ.

Basically planning for 20-50 users. Is there some sort of 'rule of thumb'
for bandwidth considerations? Is there a better way to do this period?
Currently on exch 2k3 but if there is a valid reason to upgrade to 2k7 I
would definitely consider it.

Thanks
-Andy

Archived from group: microsoft>public>exchange>design

John Fullbright · Joined: 05 Aug 2007 Posts: 365

If you remember back to the old E2K branch office deployment guide (that's
scary, has it been that long?) 50ish users in in the range where you would
start to consider a server. I think today, with cached mode clients, you
would need to evaluate the network traffic used for mailbox sync vs. the
traffic used for AD sync and mail flow.

Some things to consider:

1. SMTP traffic to from the server is in MIME format and each message is on
average 30% larger due to base64 encoding of attachments. If you place a
server at the remote site, this impacts traffic on the WAN link.

2. Each MAPI user will have to sync. If a message is sent to users 1, 2,
and 3, then all three users would connect via MAPI client and sync to the
offline folder. If the server is centrally located, this impactrs traffic
on the WAN link. The amount really depends on how often a given message is
sent to more than one user in the remote site. If a server were in the
remote site, what would the SIS be?

3. If you place an Exchange server at the remote side, you need a DC/GC
there as well. What is the level of change in your AD environment? What
would the additional AD replication traffic do to your WAN connection?

4. If you don't put a DC/GC in the remote site, then individual clients
would authenticate over the WAN. How does this traffic compare to the
alternative AD replication traffic?

Some background information that may be useful to you can be found in
http://www.microsoft.com/technet/prodtechnol/exchange/2003/clinettraf.mspx

"Andy C" wrote in message $UeQIHA.1208@TK2MSFTNGP05.phx.gbl...
>I am currently setting up a new Branch Office, and I am curious as to the
>need of having an exchange server at the remote site. They will be on the
>same domain (AD and DNS) so all the mail must come through HQ. I was
>thinking that Outlook Cached mode on the clients would allow me the ability
>to keep the exchange server at HQ.
>
> Basically planning for 20-50 users. Is there some sort of 'rule of thumb'
> for bandwidth considerations? Is there a better way to do this period?
> Currently on exch 2k3 but if there is a valid reason to upgrade to 2k7 I
> would definitely consider it.
>
> Thanks
> -Andy
>

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