RE: MAPI Connections

  • From: "Mulnick, Al" <Al.Mulnick@xxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 30 Oct 2003 13:57:43 -0500

Huh?  How many connection does each client make to an Exchange server store
via MAPI?  Answer: Minimum of three but more are possible.  That's a minimum
if using downlevel clients. I'm looking at my OL 2003 client and it has 5
connections open for one mailbox on a 5.5 server. 
5300 MAPI connections for 1900 mailboxes isn't too far off the mark
(considering there is overhead accounts that also have a connection and
mailbox e.g. system mailboxes).
Do you still think the MAPI connections are dead connections?  If so, why?
(1900 * 3 = 5700 so not all clients are active right now, but there are
system accounts creating some connections more than likely).


From: Shevill, Mark M SITI-ITDCE22 [mailto:Mark.Shevill@xxxxxxxxx] 
Sent: Thursday, October 30, 2003 6:10 AM
To: [ExchangeList]
Subject: [exchangelist] MAPI Connections

    I have a query that I would like you opinions on. I have an E2K mailbox
server with approx 1900 mailboxes on. The number of MAPI connections in is
equal to the MAPI connections out. But there is 5300 MAPI connections to the
server. I suspect that these are connections that have not been closed off
correctly by the clients. How can they be removed automatically. ?

Mark Shevill 
IMG Messaging Technical Lead 
Shell Information Technology International Limited 
Rowlandsway, Wythenshawe, Manchester M22 5SB, United Kingdom 

Tel: +44 161 435 8709 Fax: +44 161 933 3502 Other Tel: +44 7932 625510 
Email: Mark.Shevill@xxxxxxxxx 
Internet: <>  

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