Please describe the problem:
After converting an email into a task, one cannot change attendees, task status and time zone of an assigned task (buttons are disabled).

Steps to reproduce:
1. Convert an email into a task (right clicking the email and selecting "Convert to task" and selecting one task list in the "Select destination" dialog box)
2. Open the task form the task list

Actual results:
Buttons (attach, time zone and status details) are disabled, as well as the corresponding menu items. The items in the clas"Options/classification" submenu are also greyed. All other properties of the task can be changed.  


Expected results:
The corresponding properties should be changeable.

Does this happen every time?
Yes

Other information: