We are currently moving several hundred sites over to a new datacenter and server, which is using IIS + Plesk and we hit a problem with Horde.

The issue is that, after logging on to the webmail interface Internet Explorer (5.5, 6 and 7) presents the user with a totally blank screen, all other browsers we tested work perfectly Ok.

After a couple of days of head scratching plus a reimage and restore and we thought we had narrowed it down to a security/permissions problem in IE.

Not so!

It actually turns out to be a permissions problem on the server!

The answer is to locate the horde db folder

drive:\Inetpub\vhosts\webmail\horde\db (or similar)

The Fix:
Change the permissions to allow the Plesk users and IIS_USR user to have Write access to the folder and files. The default is Read, List Contents and Read & Execute.

Quite why this was a problem with IE clients only is still a mystery.

http://wiki.horde.org/FAQ/Admin/Troubleshoot#toc7

Not sure if this is entirely related, but it sounds like it could be because of the known particular http / server combination issues IE has.

......just something to look at

Hm not to sure, we had the same issue but we got the tech guys to sort it from the datacenter, i will contact them and see what they said. Its a sunday though so doubt they will be in until the monday, ill get back to you m8

Originally Posted by jamestl2

http://wiki.horde.org/FAQ/Admin/Troubleshoot#toc7

Not sure if this is entirely related, but it sounds like it could be because of the known particular http / server combination issues IE has.

......just something to look at

Aye found that, problem being we are running on IIS and NOT using SSL so it didn't really help.