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justletmelogin50's avatar
justletmelogin50
Brass Contributor
Oct 02, 2025

Outlook 365 - search broken for one user

Hi all,   Exchange 2019 hybrid Outlook 365   Most users are migrated.  We have one user who has been migrated and their search is broken in a strange way.   They can only search for some words...
RobertSparnaaij's avatar
RobertSparnaaij
MVP
Oct 02, 2025

The Current Folder and Current Mailbox search scope use Server Assisted Search whereas the All Outlook Items search scope use Windows Desktop Search.

In other words, the issue is with the online index and not the local index so switching a computer is never going to solve it.

Use Get-MailboxStatistics for the mailbox and look at the BigFunnelMessageCount, BigFunnelIndexedCount, BigFunnelPartiallyIndexedCount, BigFunnelStaleCount and BigFunnelCorruptedCount properties.

In general;

BigFunnelIndexedCount + BigFunnelPartiallyIndexedCount + BigFunnelStaleCount  = BigFunnelMessageCount

BigFunnelCorruptedCount should be 0

Any issue with this for an on-premises mailbox can usually be solve by using New-MoveRequest. When you are having issues with a mailbox in Exchange Online, you should open a support ticket via the Microsoft 365 Admin Center. 

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