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Outlook Freezing, Outlook 2010, Exchange 2010

Posted on 2014-01-15
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Last Modified: 2014-02-05
In the past month I've seen this issue arise where Outlook freezes sporadically when sending, replying, and even printing for some.   I've been seeing some other questions on EE about freezing which has lead me to do things like make sure the Exchange Servers and clients are both up to date with the latest updates, disable add-ins in Outlook.  Initially I was looking at the Exchange server to make sure there was no pressure on the resources.  I also tried office repairs, removing & recreating outlook profiles.

I'm not sure what to look at in Exchange but from reading all the other posts and answers I didn't see any indicators that Exchange itself would be the issue. To throw this in there also, we currently have two domains in this building and each has their separate Exchange environment and users on both domains are seeing the issue.  One of the servers/environments only contains 20 users and the other 500+.  

Our Environment:
Domain 1 - 20 users
Outlook 2010 on Windows 7
Exchange 2010
     1  CAS/HUB server - HP Proliant DL360 G7 (6GB RAM, 136GB local drive space)
     2  Mailbox servers - HP Proliant DL360 G5's (16GB RAM, 136GB local, 500 ISCSI space)

Domain 2 - 500+
Outlook 2010 and some 2007 with mostly Windows 7 and a few XP
Exchange 2010
     2 CAS servers - HyperV VM (16GB RAM, ISCSI storage)
     2 HUB/MBX - HyperV VM (16GB RAM, ISCSI storage)
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Question by:jonasdurst
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Author Comment

by:jonasdurst
ID: 39783529
Also,  I ran the Microsoft Exchange Best Practices Analyzer (Connectivity and Health checks) and nothing came up.
Also tested ping response time from multiple clients, each was 1-2MS replies.
Antivirus was remove from a couple clients, also one Exchange Environment (20 users) does not have any AV.  On the other it's expired and not active so It's safe to eliminate AV.
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Expert Comment

by:Simon Butler (Sembee)
ID: 39784685
If both platforms are seeing the issue, then I would have to start looking at what is common between both. Network hardware would be the place to start looking.
Network switch for example. If there are problems with speed negotiation or something like that then it could be when the port is under load that things start to struggle.

Ping doesn't really mean a great deal, it is very low level and as a diagnostic tool close to useless.

Simon.
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Expert Comment

by:Gareth Gudger
ID: 39786736
Is it the same antivirus product in both places?
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Accepted Solution

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jonasdurst earned 0 total points
ID: 39824083
I solved the issue.   I noticed that in most of the messages being sent around that the two pictures in the signatures were not loading.  Only email that had our company signature in the body of an email would cause outlook to freeze.  I then looked at the html code in the signature to see that there was a path to outside the network (in the DMZ) to a web server that had an image repository. I found that the Internet Proxy appliance that we have had some rules changes a while back and this was not letting our users get out to this address/server :-\    We made the fix on the Proxy appliance (with putting a rule in place).  
So the freezing was outlook trying to load the image into the signature before sending the message.
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Author Closing Comment

by:jonasdurst
ID: 39835077
I found the true cause to be images trying to load in outlook signatures.
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