I have rebooted several times since upgrade. Same problem.
I have no other real time scanning software.
I tried one-click:
It say "if computer running slowly" then:
"My computer runs slowly after I install a Norton 2011 product upgrade
This problem can happen if the previous version of your Norton product is not uninstalled properly during the installation of your Norton 2011 product. We recommend that you uninstall your Norton product using the Norton Removal Tool, and perform a fresh installation of your Norton product upgrade."
I will try to locate the Norton Removal Tool and then find installation software. I did the installation using upgrade software.
I believe some people are having problems when they have Automatic Scan on for Microsoft Office. Perhaps if you have this feature turned on, you could try it with it turned off and see if that makes any difference. What ports do you use for email? Norton only scans emails using the standard 25 and 110 ports; If you are required to use different ports by your ISP, then the emails are not scanned.
I wonder if your anti spam folder is still present? The following thread is an old one for NIS 2010, but I wonder if this might be involved in your problem now. I don't really know if it is or not, just trying to find something here. This may have nothing to do with your problem, sorry if it doesn't.
I know you mentioned running the Norton Removal tool already. How did you run this? We normally recommend doing a conventional uninstall of your Norton software, reboot then run the removal tool twice with a reboot in between each run. This helps to ensure that everything is removed correctly.
Also, please try the suggestions in the following post and see if it helps. This was for a different problem but I still recommend trying this to see if it has any effect.
The Norton Removal Tool leaves behind the file with your key in it on purpose so that you can reinstall the product again. and don't have to enter the key again.
Yes I run NIS 2011 with Outlook 2007, actually the full Office 2007 Standard suite and have never experienced problems like this. When I first upgraded to NIS 2011 (from 2010) my Antispam stopped working (found out a few days later) and just had to uninstall and reinstall it (not even use the removal tool) and fixed that problem.
I've never experienced anything like what you are describing.
What happens if you change the following options?
Computer Settings > MIcrosoft Office automatic scan to OFF (I know you did this part before also)
Network Settings > set both Email Antivirus scan and Antispam to OFF.
Do you still experience the slowness when you double click an email?
I notice that you are running Win 7 Ultimate 32 bit.
I am running Win 7 Premium x64.
I suspect that the 64 bit Win 7 is the key difference between our experiences.
I wish someone from Symantec would read this thread and comment on the issue of 64 bit Win 7 and Outlook 2007.
I have read some threads saying that NIS 2011 runs on 64 bit Win7 but does not integrate with 64bit IE8. I would like to know if they have tested Outlook 2007 (32 bit) on Win7 64 bit.
NIS does not support 64 bit browsers or 64 bit Outlook but does fully support running on a 64 bit OS. Being involved during the Beta I do know that your combination was tested and I don't recall seeing this problem reported during the Beta.
You mentioned having a POP account before. Are there other accounts configured in Outlook? Do you have any IMAP accounts, exchange accounts, etc? Any additional POP accounts?
Also, does the problem only happen when you double click an email? What if you just single click on it, does the email contents open in the Reading pane right away or is it also delayed? Just to confirm, is the delay occurring on the POP account you mentioned earlier?
Also when you reinstalled NIS following use of the removal tool did you run Live Update to ensure you had the latest updates to NIS? Did you reboot your computer after running Live Update?
Thanks very much and again I have requested Symantec to respond with advice on this.