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So far I have had to uninstall Mcafee, then open up Outlook and uncheck the add-ins listed as "Outlook Scanner"
After that I reinstalled Mcafee. So far it has worked ok after other than the sluggish performance.
We've had issues with that first problem when we upgraded to 8.5 and again recently with the 8.7 install. Post 8.7 I'd guess that it occurred on only a handful of the 600+ machines that we ran the install on generated the error this time around. Our decision has been to remove the add-in since we have another layer of protection on our inbound email and attachments.
I'm not sure this is the case across the board but the machines that had the 8.5 outlook scan add-in removed only display a single instance now w/ 8.7. The machines that had the 8.5 add-in now display two instances of the outlook scan.
W/ the second issue, did you uninstall the previous version before 8.7 or did you do an in-place upgrade? We've had no real issues to date by going uninstall-> install.
This will fix your first issue this has worked for me.
Outlook caches registry info on plug-ins in a file named extend.dat. The path was changed in 8.5 and above to "C:\Program Files\McAfee\VirusScan Enterprise\Scanotlk.dll" and extend.dat is out of sync with the registry settings. You can delete extend.dat and Outlook will recreate it the next time it starts.
C:\Documents and Settings\aguajardo\Local Settings\Application Data\Microsoft\Outlook