Moved messages linger and throw errors when clicked, forcing users to rely on Windows Desktop Search as a workaround.
Microsoft is eager for Outlook users to abandon the classic client in favor of the new version, but a persistent search bug hinders that effort.
Search results fail to refresh after mailbox items are moved or modified, prompting Microsoft to advise affected users to revert to Windows Desktop Search.
Microsoft has confirmed the issue. When an item is moved from search results to another folder, it remains visible and triggers an error upon clicking. Alterations to categories or read/unread status may also be impacted.
The problem affects Server‑Assisted Search for mailboxes operating in online mode. Microsoft’s temporary fix involves a registry edit that disables server‑assisted search, causing Classic Outlook to fall back to Windows Desktop Search. The company says a permanent fix is underway and the case has been escalated as a hotfix to the Outlook team, though no ETA has been provided.
Classic Outlook is being phased out. While existing installations will receive support until at least 2029, the opt‑out process begins in 2027, after which affected enterprise users will be migrated to New Outlook by default unless administrators block the move. Users can still revert to Classic Outlook, but a later cut‑over stage will eliminate that option.
Despite the transition, Microsoft has added Copilot to Classic Outlook via a ribbon button and introduced a few other quirks, such as a broken Quick Steps feature. It also acknowledged a separate issue that blocked some users from playing voicemail audio attachments.
The voicemail problem was resolved in build 16.0.20430.2000 and later, but the Server‑Assisted Search defect remains outstanding.
Recently, an update for Outlook on the Web and New Outlook began rolling out to give the newer clients a visual resemblance to Classic Outlook, aiming to smooth the migration.
However, the change is superficial; a familiar look does not restore missing functionality, and any bugs unique to Classic Outlook will not automatically carry over to the new client.®
