Vhost of mewebmail on IIS stops after a specific action

[TaskSoftware]

When I go in a domain's mail settings, and set the Webmail to MailEnable Web Client 2.0 and press OK, all domain's mailenable webmails stops working.
Mail > Mail Settings > Webmail > MailEnable Web Client 2.0

I realized the plesk stops on the iis, the vhost 'webmail(mewebmail)', probably to apply the newly added binding (webmail.domain alias), but never start it again. To get it back online I need to start it manually on IIS, or go on plesk panel: Tools & Settings > Webmail > mark MailEnable web client and click enable, and all the webmail.domain.com starts working again including the one that was just set.

Is there any fix to this problem?

 

[TaskSoftware]

Here's the solution from parallels (makeshift/workaround):

As workaround you have to create a task on event with id 1007 for source IIS-W3SVC(system log) and place a bat script in the task:

cd C:\Windows\System32\inetsrv\
appcmd.exe list site /name:"$=webmail*" /xml|appcmd start site /in

Name your task whatever you like... "webmail_start" for example

And that's it. After a specific event is logged on system log the task will run starting the webmail site.