Outlook( macOS) contents lost data for other mail account

For Outlook on Mac, recovery depends on where those old folders were stored.

• If the missing folders were under On My Computer, those items were stored only on that Mac and were not synchronized to the mail server.
• If the account was Exchange, mailbox items are stored on the Exchange server and synchronized, so server copies may still be available.
• For IMAP and POP accounts in Outlook for Mac, items other than email messages are stored on the computer, not on the mail server.

To recover old folders into the pmcglobal.com account, use this path:

1. Check whether the missing folders were in On My Computer.
   • In Legacy Outlook for Mac, those folders are local-only.
   • If they were local-only, they will not reappear from server sync.
2. Check whether the missing mail still exists on the server.
   • If the pmcglobal.com account is IMAP or Exchange, sign in through that account’s webmail and verify whether the folders or messages are still there.
   • If they exist in webmail but not in Outlook for Mac, the issue is likely local sync/display rather than deletion.
3. If the folders exist on the server but not in Outlook for Mac, refresh the affected folder cache.
   • In Outlook for Mac, right-click the affected folder.
   • Select Properties.
   • On the General tab, select Empty Cache.
   • This forces Outlook to re-sync from the server.
   • Important: only do this after confirming the items exist in webmail or after making a backup, because unsynchronized local information can be deleted.
4. If the old data was exported to an Outlook for Mac archive file, import it.
   • In Outlook, select File > Import.
   • Select Outlook for Mac archive file (.olm).
   • Select the archive file, then Import.
5. If the missing folders were from a Windows Outlook .pst repair or backup workflow, that guidance applies to Outlook for Windows, not Outlook for Mac.

If the old folders were only in On My Computer and there is no .olm archive or other Mac backup, the context does not provide a supported recovery method to restore them into the pmcglobal.com account.

References:

• About On My Computer folders in Outlook for Mac | Microsoft Support
• Missing older emails in folders - Outlook for Mac v 16.98.1 - Microsoft Q&A
• Lost email subfolders under a main folder which was renamed - Microsoft Q&A
• How to revert back to Outlook 2016 | Microsoft Support