'Reply with meeting' button causes "... operation failed. The messaging interfaces have returned an unknown error"

Hi all
We're running Outlook 2010 SP2 on W7 SP1 64-bit and getting this error when clicking the "Reply with meeting" button:-
The same error occurs whether we click this button when the message is closed or open and when we untick "close original message window when replying or forwarding".
Any ideas please?
Thanks
Scott

Hi,
You can try if this issue persists when you switch Outlook to Exchange Online Mode:
1.Click the File tab.
2.Click Account Settings, and then click Account Settings.
3.On the E-mail tab, click the Exchange account, and then click
Change.
4.Under Microsoft Exchange server, clear the Use Cached Exchange Mode
check box.
5.Exit and then restart Microsoft Outlook 2010.
This issue may be related to 3rd-party add-ins, you can verify this by running Outlook in Safe Mode:
Press Win + R and type “outlook.exe /safe” in the blank box, then press Enter.
If there’s no problem in Safe Mode, disable the suspicious add-ins to verify which add-ins caused this issue.
I hope this can help.
Regards,
Melon Chen
TechNet Community Support

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