Hi Dimitris,
I understand that you'd like to sync your contacts between Outlook client and server. According to my research, I'm afraid that an IMAP account does not sync contacts between Outlook client and server now.
As a workaround, if possible, it is suggested to apply for an Outlook.com email account, Outlook.com accounts are hosted on an Exchange server. Then you are able to sync all your data between Outlook client and server.
Hope this can be helpful.
Regards,
Aidan Wang
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