Exchange 2007 on SBS 2008 Connection Issues


We have SBS 2008 running Exchange 2007.
Our exchange account retrieves email via the SBS POP connector. Each account is linked to a separate POP email account. The POP connector downloads email every 15 minutes.

We have recently been adding more user accounts to the exchange server and have recently been experiencing connection issues.
Users outlook shows "Trying to connect" for a while but then eventually the connection is established.
Could it be that when downloading the email via the POP connector, it somehow throttles the connection to the server?

Although when a user's outlook is trying to connect, there does not seem to be any issue with the connection on a mobile device (iPad, iPhone, etc...) also not all users experience the connection issues at the same time.

I have found that when a user is having this problem being unable to connect via outlook I can run iisreset on the server and it resolves the connection issue immediately.

I don't seem to find anything in the event logs showing any issues in this regard.

Has anyone else experienced this?
Any ideas how to resolve?
Barry KaySystems EngineerAsked:
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Try to go in the management console, Server config, client access, and then, POP3/IMAP.

Double-click on POP3 and you'll find a setting to set the maximal simultaneous connexions...
Barry KaySystems EngineerAuthor Commented:
@asterisque.  I have had a looked and don't see maximum simultaneous connections, but there is a Max connections set to 2000.  (screenshot attached)
Isn't this section for clients connecting to the Exchange server via POP?
Chris MillardCommented:
I've had lots of problems with SBS POP Connector. Can I suggest trialling an alternative just as a test? I switched to a 3rd party program called POPCon and that resolved the issues I was having with the SBS POP Connector.

POPCon is available as a 30 day trial, and if it works for you, actually isn't an expensive piece of software. There's a pro version available too - you'll have to weigh up which one would suit best.
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Or as an alternarive free solution, is Davmail :

Edit. I'm not sure to understand your problem.

Your Exchange connects to another POP server (provider) to retrieve mails, or does the mails comes directly in your server and your clients connects with POP to retrieve ?
Barry KaySystems EngineerAuthor Commented:
@roybridge - What were the issues you had with the POP connector?

@asterisque - Our exchange server connects to another POP server (provider) to retrieve emails using the SBS POP Connector.
OK, and the clients connects to your Exchange with POP and not directly to the provider ?
Barry KaySystems EngineerAuthor Commented:
@asterisque - The clients connect to exchange using the Exchange connection option in MS Outlook with "Connection to Microsoft Exchange using HTTP" enabled so they can have access from anywhere.
This is why I need to run iisreset to resolve the issue immediately when clients MS outlook is stuck on "Trying to Connect" ... If I don't run iisreset the clients do eventually connect but is takes some time.
Barry KaySystems EngineerAuthor Commented:
I found this and implemented it.

Problem seems to be resolved now. No one has been having connection issues with MS Outlook. Will keep monitoring it.

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Barry KaySystems EngineerAuthor Commented:
My comment above helped as I don't need to reset IIS as often, but I still do experience this problem occasionally.

It is not related to the POP connector as that seems to be working fine. It just seems to be with outlook connections when RPC is set.
Barry KaySystems EngineerAuthor Commented:
My solution helped as I don;t have the problem occurring as often. No other support has been given.
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