Physix Frontier · News Briefing Card (IT Home · Oct 7, 2026)

Microsoft Confirms Classic Outlook Online Search Bug

KEY FACTS

Microsoft updated its support documentation on September 29, acknowledging a search bug in classic Outlook.
The bug involves Server Assisted Search and affects mailbox search in online mode.
After emails are moved or their status changed, they remain in the original search results, and clicking them triggers an error.
Microsoft has escalated the issue to the Outlook team as a hotfix, with the status set to fixing.
No official fix timeline has been given, and disabling the search is recommended as a temporary workaround.

KEY DATA

September 29, 2026Documentation Update Date

16.0Registry Path Version Number

1Disable Switch Value

PHYSIX OBSERVATION

Server-assisted search was meant to improve the online mode experience, yet it exposed a hard flaw: results falling out of sync with mailbox state. Microsoft offers only a registry edit as a temporary workaround, which sets a high bar for ordinary users, and it also shows this mechanism still needs remedial work on state synchronization.

Source: IT Home report