Outlook 2003 Calendar Printing – “The messaging interface has returned an unknown error”
June 8th, 2008
Problem: 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 error message:
“The messaging interface has returned an unknown error. If the problem persists, restart Outlook.”
Solution:
Disable the TaskPad option
1. On the File menu, click Print.
2. Click Page Setup.

3. On the Format tab, click to clear the TaskPad check box.
4. Click OK to close the Page Setup dialog box.
5. With the Daily Style print style selected, click OK to print the shared calendar.
and u are good to go!!
Great solution! have the problem on Outlook 03 and this tip gave me my 15 seconds of glory!
Thanks!
I had a very hard time finding solutions to all these problems when I came across them.. so thought of putting them all together at one place. Good to know these were of some help to u.
Worked a treak! thank you!
Thanks a ton for this, helped me tremendously.
Worked perfectly. million thanks. even our IT dept couldnt resolve this issue.