The search is not working anymore in Outlook 365 after the upgrade to Windows 11

Question

The search is not working anymore in Outlook 365 after the upgrade to Windows 11

Cornel Amarandei 0

Hi,

I have an user that cannot search anymore in Outlook after the upgrade to Windows 11 was performed. The version of Outlook is "Microsoft® Outlook® for Microsoft 365 MSO (Version 2408 Build 16.0.17928.20654) 64-bit". The error is "Something went wrong and your search couldn't be completed. It looks like there's a problem with your network connection."

What I have tried so far:

repair Office
rebuild the Index in Outlook
create a new mail profile
check the Windows Search service is running
remove the OST file from C:\Users<username>\AppData\Local\Microsoft\Outlook\
create in the registry the keys DisableServerAssistedSearch (1) and DisableServerAssistedSearch (0)
check the version of the Windows 11: it's a new one, should contain all the fixes for this issue
start Outlook in safe mode, the same behaviour
make sure Use Cached Exchange Mode is enabled (File → Account Settings → Account Settings → [mailbox of the user] → Change)

Thanks!

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Answer 1

Jayden-P 6,120 Microsoft External Staff Moderator

Hi @Cornel Amarandei

Thank you for posting your question in the Microsoft Q&A forum.

I saw that you have tried a lot of ways but still no luck.

May I know if you search in primary mailbox or a secondary mailbox?

You can try one of these:

Update your Outlook
Clear RoamCache: Press the Windows + R > Type %localappdata%\Microsoft\Outlook > Find the RoamCache folder > Delete all files in it.
Rebuild Window indexing in Control Panel

Please try and let me know if it works for you, if not, we can figure out another approach.

Thanks for your cooperation.

Jayden-P 6,120 Reputation points Microsoft External Staff Moderator

2025-08-28T13:09:21.8166667+00:00

Hi @Cornel Amarandei

Any update from you?

I'm looking forward for your reply.
Cornel Amarandei 0 Reputation points

2025-08-29T07:36:16.8733333+00:00

Hi Jayden-P,

I've tried your suggestions and unfortunately the problem is still there. I am searching in the primary mailbox.

Please let me know if you have other ideas.

Thanks!
Jayden-P 6,120 Reputation points Microsoft External Staff Moderator

2025-08-29T08:42:52.1033333+00:00
Hi @Cornel Amarandei

I have one last solution, please try creating a new Windows profile.

Go to Settings > Accounts > Family & other users > Add account

There are two options (Microsoft account and Offline account): Choose Microsoft Account

Then continue log in with your Microsoft account.

You can set up role for the new profile (Administrator or Standard User)

Then you can try signing into Outlook again.

Check if you can search in your primary mailbox

I hope this will work for you.

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The search is not working anymore in Outlook 365 after the upgrade to Windows 11

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