Error: "The operation failed. The messaging interfaces have returned an unknown error.",

Error during syncing:  "The operation failed.  The messaging interfaces have returned an unknown error.",

The specific error is coming directly from Outlook and it usually indicates some kind of problem with the Outlook .pst/.ost file, or the Outlook profile itself. Here are several things you can try:

Repair the Outlook application:
https://support.office.com/en-NZ/Article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b

Scan and Repair the .pst/.ost file:
https://support.office.com/en-us/article/Repair-Outlook-Data-Files-pst-and-ost-25663bc3-11ec-4412-86c4-60458afc5253

Recreate the Outlook Profile:
https://support.microsoft.com/en-us/kb/829918

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