Thank you much sir. You should not have to remember what version I am on no 
matter how young you are.  I am on Exch. 2010. Yea, that is a lot of 
connections, I will dig in on it.

From: [email protected] [mailto:[email protected]] On 
Behalf Of Michael B. Smith
Sent: Monday, July 27, 2015 11:47 PM
To: [email protected]
Subject: [Exchange] RE: Event ID 9646 Mapi connections

It's an implementation detail within Exchange. It is optimized to provide no 
more than "that many" connections. If you exceed that number, it will have a 
negative performance impact. How much is somewhat debatable.

You don't mention your version of Exchange (and perhaps you have done so here 
many times before, but I'm over 50 and suffer from CRS syndrome). If you are on 
2010 or 2007, I'd spend some time with Exmon figuring out how the user exceeds 
16 connections. That's a lot of connections.

From: [email protected]<mailto:[email protected]> 
[mailto:[email protected]] On Behalf Of Kennedy, Jim
Sent: Monday, July 27, 2015 9:21 AM
To: [email protected]<mailto:[email protected]>
Subject: [Exchange] Event ID 9646 Mapi connections


Last week I had a user, on their personal home machine, hit the 16 MAPI 
connection limit when using OWA via Firefox and got:  "A problem occurred while 
you were trying to use your mailbox."  Now I know I can increase that limit 
with a regedit but we have never had this before.

Thoughts on what could be causing this on his end? I know nothing about the 
machine yet, other than he was using Firefox.

Downside to regediting this limit upwards...suggestions on a reasonable number?



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