BES/MAPI question

yoshi66 · #1 (**permalink**) 06-03-2010, 05:17 PM

Hello

I've been looking into introducing a BES server into my Exchange environment and had some questions about how BES and Exchange connect in terms of MAPI.

So I understand that there are mailbox agents on each BES. And it's these mailbox agents that have MAPI threads to Exchange.

My questions are:

1. Does each BES server connect to Exchange, via MAPI, using the BES service account?

2. Is a MAPI thread the same as a MAPI connection? Or can there by several MAPI threads within one MAPI connection?

3. In order for BES to receive the UDP notification that a user has a new message, there must be some sort of permanent connection with Exchange - is this one permanent MAPI connection? Or many?

4. If there was an RPC call from BES and an RPC call from Outlook, would they both have the same effect on Exchange, or can one RPC call (e.g. BES) actually take more resources in any way? Surely no since they are just MAPI connections?

Anyone that can clear this for me would be really appreciated!

hdawg · #2 (**permalink**) 06-07-2010, 08:51 AM

Comments in line ...

Quote:

Originally Posted by yoshi66

Hello

I've been looking into introducing a BES server into my Exchange environment and had some questions about how BES and Exchange connect in terms of MAPI.

So I understand that there are mailbox agents on each BES. And it's these mailbox agents that have MAPI threads to Exchange.

My questions are:

1. Does each BES server connect to Exchange, via MAPI, using the BES service account?

Yes. For versions of Exchange prior to Exchange 2010 BES connects to each mailbox server with BES users it has loaded. For Exchange 2010 BES connects to CAS and not mailbox servers.

2. Is a MAPI thread the same as a MAPI connection? Or can there by several MAPI threads within one MAPI connection?

Multiple threads are spawned from a single connection.

3. In order for BES to receive the UDP notification that a user has a new message, there must be some sort of permanent connection with Exchange - is this one permanent MAPI connection? Or many?

It is many connections ... if you use a tool to look at the # of connections to Exchange you can see this data.

4. If there was an RPC call from BES and an RPC call from Outlook, would they both have the same effect on Exchange, or can one RPC call (e.g. BES) actually take more resources in any way? Surely no since they are just MAPI connections?

Depends on the version of BES and version of Outlook ... that said, an RPC call is an RPC call.

Anyone that can clear this for me would be really appreciated!

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