Issue with office 2016 64bits


I’ve been trying to update my office to 2016. I have installed 2010 (for other reasons) and the 2013 worked fine… but when I update the office throws me this error.

Send Outlook Mail Message : Unable to cast COM object of type ‘System.__ComObject’ to interface type ‘Microsoft.Office.Interop.Outlook.Application’. This operation failed because the QueryInterface call on the COM component for the interface with IID ‘{00063001-0000-0000-C000-000000000046}’ failed due to the following error: Interface not registered (Exception from HRESULT: 0x80040155).

I have uninstalled everything and reinstall only office 2016 64 bits (I am trying to send an outlook email)

add the ole32 entry to the registry by doing this

Regsvr32.exe %Windir%\System32\Ole32.dll

but it’s not working…

any help will be greatly appreciated.

  • update 1 hour later * installed ccleaner… fixed the registry … nothing changed.
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@Gabriel_Tatu will confirm…

What I did is that I erase from the registry the key


now it is just saying that

Send Outlook Mail Message : Object reference not set to an instance of an object.

I guees I will try to fix this later on.



Now it is working just fine… just to confirm the issue it has to do with my office not with UiPath… I just posted for further reference.

I reinstalled the mail activities just to be sure.

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Hi. I’m having the same issue as you. I’ve managed to overcome the interface not registered issue by creating some registry keys under the following (I haven’t been able to find any superseded keys such as 9.5 to delete):



However, now I’m stuck with an object reference error.

How did you get past the object reference error?

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