Legacy Outlook for Mac support ends in 2026: Users face urgent data import deadline
Microsoft has set a hard stop for legacy Outlook for Mac. The final date is October 2026. After that, official support ends. Users who still depend on the old app have little time left to secure their emails, contacts, calendars, tasks, and notes. UCSF Information Technology Services links this deadline to the shutdown of Exchange Web Services (EWS). When EWS retires, legacy Outlook for Mac will lose Exchange mailbox access. Users will be forced to switch to New Outlook for Mac. The move is automatic for those still on the old client.
George Mason University has confirmed that starting October 2026, the legacy Outlook for Mac desktop client will no longer work with Exchange Online, requiring users to switch to New Outlook for Mac or Outlook on the Web.
Some data sources are blocked. Users hoping to import calendars or contacts from Outlook on the web, iCloud, or Google are out of options. Microsoft points them to its Feedback Portal. There is no promise these features will arrive before support ends. Many are now searching for workarounds as the cutoff nears.
Windows users must first export all needed data to a .pst file. Next, they move the file to a Mac. Import starts in the Tools tab. Select Import, then choose Outlook for Windows archive file (.pst). Imported items show up under On My Computer. If those folders are hidden, users need to change Outlook settings to reveal them. A UCSF IT advisory warns: missing the October 2026 deadline could mean permanent data loss.
Independent Mac software coverage notes that while Microsoft has extended legacy Outlook for Mac support to October 2029, Exchange Online access for many users will still end in October 2026 due to the separate retirement of Exchange Web Services (EWS). This distinction means some users may retain local functionality but lose cloud connectivity.
Microsoft's own documentation is blunt. Continued use of legacy Outlook for Mac depends on your Microsoft 365, Office, or Outlook license. The company has more details on its End of support for legacy Outlook for Mac page. The message is clear. Act before October 2026 or risk losing access to your data. A September 2026 Microsoft 365 notice from George Mason University confirms: legacy Outlook for Mac will stop working with Exchange Online in October 2026.
The end is now in sight. Users must take charge of their archives. There is no support for importing web-based, iCloud, or Google data. The process is manual and detail-heavy. For anyone still on legacy Outlook for Mac, waiting is risky. Miss the deadline and you could lose years of emails and contacts. No safety net. No second chance.
