Re: exchange basics

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"SP" <anon@xxxxxxx> wrote in message
news:uWbsTAxYFHA.3572@xxxxxxxxxxxxxxxxxxxxxxx
> Thanks very much ... I really appreciate your reply on Exchange for
> Dummies.
>
> Questions:
> 1. POP3 host if so configured: Does that mean Exchange is not configured
> as a POP3 host out-of-the-box ?
Can't recall at the moment. Bet you can find that information at
http://www.microsoft.com/exchange/library Even if it's not out of the box,
that's trivial to configure for users. See the help files for exact steps.

> 2. If Exchange is not configured as a POP3 host, what does it use as a
> message retrieval protocol ? Is it Exchange native ?
MAPI is the de-facto standard. Outlook uses MAPI to communicate with
Exchange stores. POP3 has the disadvantage of wanting to download the
messages from the central store to the client store. Makes recovery of
messages messy. It also is very basic in it's functionality and although it
has it's uses, has no server side rules, or other rich features that some
users want. Shared calendaring for example. MAPI allows for those
features.


> 3. Of POP3 host and Exchange native host, can Exchange support both at the
> same time ? Or just one or the other ?
Supports both and then some. Exchange is a great tool to deploy as an
upgrade from other systems because it can talk so many protocols at the same
time.

> *In other words, on the MUAs side, say, we have 10 users running
> Outlook 2003, and we have Exchange configured as POP3 host. Can 5 of the
> users configure their Outlook to connect to POP3 server while the other 5
> users configure their Outlook to connect to Exchange server ?
I think you mean can 5 of the MUA's connect to the Exchange store via POP3
(or IMAP right?) and 5 other MUA's connect via MAPI (Outlook corporate
mode). If that's what you meant, then yes. Even a step further: the
clients can switch back and forth between client protocols keeping in mind
where the mail ends up. Best not to do that, but they can. Just for fun,
they can also access via WebDav and/or HTTP. The nice thing about that is
you can use other client types such as Ximian's (Novell now) Linux Outlook
knock-off client (MUA). Gives a richer feature set to the end user.

> 4. Is there any loss or gain of functionalities if Exchange is configured
> as POP3 host ?
It's not the host to worry about. Think of it as a multi-protocol message
router. It'll answer for many protocols and provide the mail the way the
protocol requires it. It understands and speaks most of the protocols out
there (might be all of them, but I haven't checked to verify all of them.)
However, you are subject to the limitations of the protocol itself. In the
case of POP3, you are limited to it's abilities such as downloading from the
server else finding another way to deal with the messages. Note that some
MUA's will deal pretty well with POP3 functionality by not strictly
following the RFC and instead allowing things like leaving the messages on
the server-side store and so on.


> 5. What are other MTAs available out there ?
For just POP3? Many. Too many to mention. It's usually needs based to
figure out which one is best for you. Some of it is preference as well.
Even Windows Server 2003 includes a pop and smtp server these days and is
intended for small shop impelementations.

Does that help?

Al

>
> Thanks again
> Steve
>
> "Al Mulnick" <amulnick_No_SPAM@xxxxxxxxxxx> wrote in message
> news:%23WpTdwvYFHA.612@xxxxxxxxxxxxxxxxxxxxxxx
>> Yikes. That's confusing.
>>
>> Exchange is a MTA - Message Transfer Agent. SMTP is a message transport
>> protocol. Exchange uses SMTP to transport messages (by default).
>> Exchange is a message store. It stores your messages in a database for
>> you the client using a MUA - message user agent (such as Outlook) to come
>> pick it up later.
>> POP3 is a protocol for picking up your mail from a message store
>> utilizing a MUA. Exchange supports POP3.
>> POP3 Connectors are for people that want to pick up mail from an ISP
>> mailbox and put it into Exchange. POP3 is still a message retrieval
>> protocol. It is not for sending. It never has been. SMTP is a
>> transport protocol which Exchange uses to transport messages to other
>> servers. When it does this transaction, it is the 'client' in the
>> client-server terminology used to describe SMTP transactions. Your MUA,
>> if configured to use POP3 as it's message retrieval protocol, will also
>> be configured to use a SMTP MTA (all that really means is that you send
>> your outgoing mail to a host that understands and listens for SMTP
>> commands on a well known port (usually)) if you hope to send mail to
>> anybody other than yourself. Not that talking to yourself is a bad thing,
>> it's just that if you go to the trouble to pick up your mail, it would
>> seem like a good idea to send something to others so you can share wit
>> and humor and pictures of the kids doing silly things with water balloons
>> or mud. I digress. In this situation, your MUA will also be a client to
>> a SMTP MTA.
>>
>> Exchange natively speaks SMTP and will communicate as a POP3 host if so
>> configured. If you go that route, I suggest you utilize front end
>> servers so you can move mailboxes around without reconfiguring MUA's.
>>
>> You can read more about Exchange at http://www.microsoft.com/exchange
>>
>> -al
>>
>>
>> "SP" <none> wrote in message
>> news:%23jc3pqpYFHA.2756@xxxxxxxxxxxxxxxxxxxxxxx
>>> Hi
>>>
>>> Of POP, SMTP, and whatever else, is Exchange one of those ? Or is
>>> Exchange native to itself ? A class of its own - like POP and SMTP ?
>>>
>>> I understand Exchange itself can't be POP since it uses POP connector to
>>> connect to some POP server.
>>>
>>> Steve
>>>
>>
>>
>
>


.

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