Start Outlook in safe mode by typing the command outlook /safe in the Windows ‘Run’ dialogue and hit Enter.Thus as a first step, disable any add-ins you may have installed in your MS Outlook application:

Bugged or corrupted add-ins can hamper the proper working of Outlook, and the error in question is just one of the many ill-effects they bring. While Outlook add-ins are installed to augment its functionality, more often than not, they have been known to cause problems. Launch Outlook in Safe Mode & disable Add-ins

You can try out the following fixes in order one at a time to resolve Outlook not implemented error.

Improper Integration of Outlook with Anti-virus program.

Messed up Send / Receive Settings (Damaged SRS file).

The primary reasons that play a part in triggering this error include: The not implemented outlook 2007 error is most commonly seen when users try to perform a Send/Receive operation, or try to initiate a Reply / Reply All / Forward operation on their Windows 10/8/7 computers. Reasons behind Outlook error code “not implemented.” The tips are closely tied to the actual roots of the error, so that’s where we’re going to start. If you’re among such users, we’ve got some helpful tips that will enable you to get on top of this error. Quite naturally, there isn’t much they can come up with to resolve it. This is quite an unusual sight for Outlook users, and they easily get confused by the error message “Outlook Not Implemented”. Among them is the “not implemented” Outlook error. Though Microsoft Outlook is largely unscathed by problems, some errors can get too tough to handle it. Let us closely look at the causes of this error and see how it can be fixed. On hitting the send/receive button in Outlook, if you encounter the “Not Implemented” error, it is usually indicative of problems with MS Outlook.

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