I am having the same issue as described here: Outlook templates with attachments failing to open .oft file error "The attempted operation failed. ....
When the Adobe Document Cloud for Microsoft Outlook add-in is enabled in Outlook, OFTs with attachments fail to open. Attempting to open the OFT results in this error:
Microsoft Outlook
The attempted operation failed. An object could not be found.
[Ok]
When I disable the Adobe Document Cloud for Microsoft Outlook add-in in Outlook, the issue goes away.
I'm guessing this is a known issue?
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