Outlook Error Message

Have you ever had problems printing daily shared calendar and got an error message
"The messaging interface has returned an unknown error. If the problem persists restart Outlook".
This error might occur if you have delegate rights to someone's Calendar but not to their Tasks and you are trying to print their calendar using Daily Style which includes printing task pad. This problem can be resolved by modifying the Print style to exclude task items.
If you go to File--Print--Define Styles. Highlight Daily Style and click on the Edit button then uncheck the Include TaskPad option and click OK. You will be able to print daily calendar after this.
Another way to get it fixed is to ask calendar owner to include permissions for Tasks.