Error opening shared calendar in Outlook 2007

[darkchrno]

Hi,
The share calendar was working fine yesterday and this morning when I
click on Calendar to view my calendar, the shared is uncheck and when
I try to check it, it shows error: "The messaging interface has
returned an unknown error. If the problem persists, restart Outlook".
I have restarted Outlook and it didn't help either. It happened before
and I have to delete the shared calendar and added it back in.

Any clue on why this is happening or any solution to this one?

Thanks.

 

[darkchrno]

Hi,
The share calendar was working fine yesterday and this morning when I
click on Calendar to view my calendar, the shared is uncheck and when
I try to check it, it shows error: "The messaging interface has
returned an unknown error. If the problem persists, restart Outlook".
I have restarted Outlook and it didn't help either. It happened before
and I have to delete the shared calendar and added it back in.

Any clue on why this is happening or any solution to this one?

Thanks.

I fixed it myself. Here's the step:
1. Close Outlook
2. Open Task manager
3. Find OUTLOOK.EXE under Process tab
4. End that process
5. Open Outlook again and I'm able to select the calendar again.

My guess is when I thought I have close Outlook, it didn't really
disappear from background process.