Quite possibly the most trusted and tenable email customers is Microsoft for both business correspondence also for the individual employments. Notwithstanding, once in a while when the client attempts to send or get messages a mistake abruptly shows up before the client with the accompanying message "Not Implemented"
Read more here:- https://www.datarecovo.com/fix-outlook-not-implemented-error/
1. Launch Outlook in Safe Mode & disable Add-ins
Start Outlook in safe mode by typing the command outlook /safe in the Windows 'Run' dialogue and hit Enter. This will launch Outlook for all add-ins disabled.
Go to Outlook Options -> Add-ins -> Go.
Now try send/receive, or reply / forward and see if it works.
2. Correct Send / Receive Settings by recreating the SRS file
MS Outlook saves your preferences and personal Send / Receive settings in a file called the SRS file. Damage to this file is one of the most obvious reasons behind the Outlook error code “not implemented”. Thus, reset all SRS file settings by recreating it:
Navigate to the folder C:\Users\%username%\AppData\Roaming\Microsoft\Outlook\
Rename the files Outlook. Srs to something else like Outlook. Srs. old
Restart Outlook to recreate the SRS file automatically
Check if send/receive works
Let me know if this resolves the issue. Get more information on how to do office 365 to office 365 migration at O365CloudExperts.
Regards, Caleb