A search defect in Classic Outlook causes moved messages to remain visible in results and to generate errors when opened, according to Microsoft's own documentation. Affected users experience stale results that do not reflect recent changes to mailbox items, category assignments, or read/unread status. Microsoft recommends disabling server‑assisted search via a registry edit, which forces Classic Outlook to rely on Windows Desktop Search as a temporary workaround. The company has classified the problem as a hotfix for the Outlook team and confirms that a permanent patch is under development, though no release schedule has been provided. Classic Outlook is slated for retirement, with mainstream support ending in 2029 and a forced migration to the new Outlook client beginning in 2027 for enterprise customers who do not block the transition. While the upcoming update to Outlook on the web and the new Outlook interface will adopt a visual style reminiscent of Classic Outlook, Microsoft warns that functional parity has not been achieved and that certain bugs, such as the recent Quick Steps malfunction, remain confined to the legacy client. A separate voicemail attachment issue was resolved in build 16.0.20430.2000, but the search defect continues to affect users who depend on server‑assisted indexing for large mailboxes.