Results 1 to 3 of 3
  1. #1
    Super Moderator jscher2000's Avatar
    Join Date
    Feb 2001
    Location
    Silicon Valley, USA
    Posts
    23,112
    Thanks
    5
    Thanked 93 Times in 89 Posts

    1 Exchange server for 2 networks?

    Here's the scenario: a branch office is tied to the home office through a VPN. The VPN runs through the "internet cloud" and is T1 (1.5 Mbps) or close on both ends. As a result, the network functions as a single domain, but of course, access from the branch office to the home office is not just like being there.

    Would it be ridiculous to implement only one Exchange server (in the home office) under these circumstances? Would the performance in the branch office be so miserable that the IT department would start receiving suspicious packages with protruding wires? Would it matter if we change the delivery point from the Exchange mailbox to the user's PST?

  2. #2
    Super Moderator jscher2000's Avatar
    Join Date
    Feb 2001
    Location
    Silicon Valley, USA
    Posts
    23,112
    Thanks
    5
    Thanked 93 Times in 89 Posts

    Re: 1 Exchange server for 2 networks?

    I found a partial answer after about an hour of perusing:
    <hr>Branch Offices
    Many branch locations may not be able to maintain their own servers running Exchange 2000, so clients will have to access an Exchange 2000 computer across a wide area network (WAN) link. In many branch locations, Outlook will function in MAPI mode even without a local server running Exchange 2000. Whether or not to use Outlook 2000 in MAPI mode will depend mainly on two factors:
    Does the location have a permanent link?
    If the branch office has a permanent link, then no special installation requirements of Outlook are needed. If the link is not permanent and available (for example, ISDN), then the Outlook client should be configured with Offline Folder support and an Offline Address Book. Outlook 2000 has significant improvements over previous versions of Outlook, because the synchronization of these files has been moved to a background process. Note that the initial creation of Offline Folders and the Offline Address Book may require significant time and traffic in a large, established messaging environment.
    If the clients have a relatively short connection time to the server running Exchange, then it may be appropriate to set the Outlook client up as either an IMAP4 or even a POP3 client. These will require less traffic on the network.
    How much bandwidth is available?
    Currently, the kilobits per second (Kbps) of available bandwidth required per user depends on the messaging usage of the group (often called a messaging profile). 2.6 to 3.2 Kbps of available and persistent bandwidth is required per user for up to a medium profile (users that use e-mail as a significant portion of their job), while 6 to 9 Kbps must be available for a heavy messaging profile (the most top-heavy percentage of e-mail users).
    Note that these numbers assume that there is at least 56 Kbps of available bandwidth (It is unlikely that a single heavy messaging user will be satisfied with a 6-Kbps link), as the numbers take into consideration the likelihood of users simultaneously using the link. Less available bandwidth than this may work, but users are likely to complain about poor performance.

    <A target="_blank" HREF=http://www.microsoft.com/technet/prodtechnol/exchange/proddocs/ex2kupgr/planus/p_08_tt1.asp>Chapter 8 - Choosing Client Access Methods</A><hr>
    So as a ballpark, it sounds as though we have to assume that for 20 users we would consume about 100 kbps of the connection with Exchange traffic. That sounds manageable. Is it realistic in your experience? Anyone?

  3. #3
    Platinum Lounger
    Join Date
    Jan 2001
    Location
    Roanoke area, Virginia, USA
    Posts
    3,729
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: 1 Exchange server for 2 networks?

    i don't recommend using pop or imap - you lose the special folders (tasks, calendar, contatcs)

    i don't recommend using psts - you lose easy backup of mailboxes.

    i do recommend using ost - offline storage. it gives you the full features of the exchange experience and cuts bandwidth usage.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •