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Pop-up message: “The Microsoft Jet database engine cannot open the file ‘C:\Program Files(x86)\1and1Mail\tnedm.ado’. It is already opened exclusively by another user, or you need permission to view its data.”

Please follow the steps below to resolve the issue: Right click the 1and1Mail icon on your Desktop Select “Properties” Go to “Compatibility” tab. Select the last option “Run as an administrator”. And then run 1and1Mail....
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