SYMPTOMS

When accessing webmail, the folder list is missing and the message list is not shown.

CAUSE

This is caused by when the server is upgraded to .Net 4.7. This version has a bug in a caching function where it is expired immediately.

RESOLUTION

For users running version 9, upgrading to version 9.75 or later will resolve the issue.

If you are running version 8 or earlier you can either uninstall the .Net 4.7 if this is not required by other software, or edit the following file in Notepad:

Mail Enable\bin\Netwebmail\web.config

Between the <system.web> and </system.web> tags, add the following:

<caching><cache disableExpiration="true"/></caching>