I haven’t done a post in a while, but this issue had been bugging us for ages, and now we have finally found a fix due to a very helpful forum post.
Basically our set up is as follows;
vSphere 5.1 (Latest patch as of Oct 2014) (VMXNET3 VM adapter)
Server 2012 R2
Exchange 2013 CU1
Outlook 2010 / 2013
We were finding that users were clicking from email to email and there was a lag of 2 seconds or so whilst clicking.
Not only that but also sending emails and whatever else Outlook does.
It didn’t seem to affect Windows 8 users, but did for Windows 7.
Follow this forum post… it worked brilliantly