Hi,One of our users is getting the following error --->The messaging interface has returned and unknown error. Please restart outlook....He is getting this error while printing shared calendar. The problem while printing is only when he prints the calendar daily. There is no problem when print weekly and monthly....What can be the problem....Thanks.

Open the shared calendar. On the Outlook File menu, click Print. Under Print Style, click to select Daily Style and click Page Setup. Click TaskPad to deselect it. Click OK and OK to close and print Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Which version does the problematic outlook has? When you try to print another user's shared calendar in Microsoft Office Outlook 2003, the calendar does not print. Additionally, you receive the following generic error message: The messaging interface has returned an unknown error. If the problem persists, restart Outlook. This problem occurs when you do not have the permissions to view that user's Tasks folder ----------Refer to <Description of the Outlook 2003 hotfix package (Outlook.msp): April 28, 2009> Other related KBs: Error message when you try to print another user's shared calendar in Outlook 2003: "The messaging interface has returned an unknown error"