Although I'm aware that IE8 is not an officially supported browser I do remember seeing that support was added in the .16 patch. Unfortunately I'm experiencing an issue with my webmail that causes it to hang sometimes for a least ten seconds when I click on a different tab. This always happens within clicking ten tabs. I checked resource usage on the client and on the server and they seem fine.
Client: 3.2Ghz Core 2 Duo with 4GB memory running Vista 64-bit
ZCS: 2.2Ghz Dual-core Opteron with 2GB running on Ubuntu 64-bit on ESXi 4.0
When I run with Firefox everything is fine. Unfortunately I'm testing this for eventual rollout to a production environment where Firefox isn't an option.
Any thoughts? Pardon the lack of specifics but I'm something of a Zimbra newbie. If you can tell me where to gather detailed logs I'd certainly be willing to do a little legwork.