Forum Discussion
Outlook - Online mode address book search fails with "Operation failed" when Name only is ticked.
I hope you had this issue and managed to solve 😂 pulling my hair already.
Symptom:
In classic Outlook for Windows, open the Address Book → set Search to Name only → type any single character → "The address book operation failed." Switch to More columns and the exact same search works fine. Ctrl+K resolution in the To: field works. OWA people search works. Mail flow is fine. It's only the Name-only ANR seek in the dialog.
Environment:
Exchange hybrid, mailbox in Exchange Online, dir-syncedfrom on-prem AD via Entra Connect
Classic Outlook for Windows, online mode (Cached Mode is not permitted here — this is the constraint, I can't just flip it)
Affects all users, all machines
What I've already ruled out:
Test Result
- Other address lists (Contacts, All Users) Same failure
- Ctrl+K in To: field Works
- Safe mode (outlook.exe /safe) Same failure — not add-ins
- Multiple accounts / multiple machines Same failure
- Brand-new mail profile Same failure — not profile corruption
- Addressing order (Tools > Options) GAL set first, not "Choose automatically"
- Off corporate network (5G) Same failure
- AddressBookPolicy / OfflineAddressBook on mailbox Both blank (inherit defaults)
- Get-OfflineAddressBook Default OAB, IsDefault: True, web dist enabled
- Get-GlobalAddressList Default GAL, IsDefaultGlobalAddressList: True, stock default RecipientFilter
1 Reply
This is narrowly isolated to the Address Book dialog’s Name only ANR search in classic Outlook online mode. Because More columns, Ctrl+K, OWA, safe mode, new profiles, other networks, and multiple machines work, this does not resemble an OAB download or local-profile problem. OAB troubleshooting primarily applies to Cached Exchange Mode, while your clients query the directory online. First check Microsoft 365 Service health for Exchange Online or Outlook incidents. Then record the exact Microsoft 365 Apps version, build, architecture, and update channel from affected machines, and compare with a supported build on one controlled test device. Run Microsoft’s Outlook diagnostics through Get Help and capture a reproducible UTC timestamp. If all users still fail, open an Exchange Online support case with the tenant ID, build, hybrid topology, ANR steps, and proof that More columns succeeds. I cannot confirm a published Microsoft issue for this exact Name only failure.
