Information:
When trying to print a Shared Calendar in Daily Style you receive the following error message "The messaging interface has returned an unknown error.  If the problem persists, restart outlook." This is maybe caused because the user don't have full permission to print the Task List from the shared user calendar.

Solution:
Printing Without TaskPad Information

Follow these steps to deselect the TaskPad option when printing the Daily Style:
1. Open the shared calendar.
2. On the Outlook File menu, click Print.
3. Under Print Style, click to select Daily Style and click Page Setup

4. Click TaskPad to deselect it.

5. Click OK and OK to close and print