Contacts missing in OWA after migration to Exchange Online

Question

Hi
We migrated onprem mailboxes to exchange online.
Now migrated users have the problem, that contacts are not visible in EXO owa.
They are present in outlook, with and without cache mode active.
They can be synchronized to the mobile device.
Running get-mailboxfolderstatistics on the contacts folder in Exchange Online shows 200 items in the contacts folder, but contacts in OWA are empty.
When the user edits a contact in outlook or on the mobile device, then this contact is visible in OWA, but the contacts folder still shows 200 items by checking it using powershell. So ist's not a new contact that has been created. Editing the existing contact just made it visible in EXO owa.

Any ideas?

Regards
Peter

Answer 1

Hi @Peter,

 

Based on research, it is recommended that you can try to reimport the contacts.

First, you need to export contacts to a CSV file from on-prem EAC, and then bulk import them step by step via this guidance: Bulk import external contacts to Exchange Online - Microsoft Purview (compliance) | Microsoft Learn

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Answer 2

Sounds like the contacts were in local PST files and not within their old Exchange. Look around for PST and OST files on the old computers.

Answer 3

Hi @Peter ,

What if adding a new contact in Outlook or mobile device? Can it show up in OWA?

Probably you can try on one affected user's Outlook by exporting the contacts and then importing them back(Choose replace duplicates...) and see if it can make any difference.

• Export or backup email, contacts, and calendar to an Outlook .pst file
• Import email, contacts, and calendar from an Outlook .pst file

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