Powershell to restore contacts folder and contents in Outlook2016/Office365.

One of my customers reports that all his Outlook Office 365 contacts are gone. This occurred after a successful (for the hackers) phishing attempt. They got his credentials and started emailing all his contacts. We changed his password and things quieted down immediately, but his contacts were gone. I have attempted to restore from both the web interface and Outlook 2016 on the desktop but it only lists email messages, and no contacts.
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HardwareDudeAuthor Commented:
Vijaya- yes, I tried that already.
Vijaya KumarCommented:
i am working on it let u know once done
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Casey WeaverManaged Services Windows Engineer IIICommented:
If there is a retention policy you can get an old copy of the mailbox exported from the portal. If not, reach out to Office 365 support and they should be able to get you a PST from within the last 30 days from which you can restore the contacts out of it, that is if the contacts were synced with the exchange account and not just local to the computer.
Vijaya KumarCommented:
try recuva soft so that u can get ODT files, this has contact details.
Casey WeaverManaged Services Windows Engineer IIICommented:
Seems that both comments gave the best industry standard solutions. Vijaya had source to the actual article on how to do it.
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