Why Do Folders Go Missing in Outlook?

1. Microsoft Outlook AutoArchive: Outlook has a built-in feature called AutoArchive that automatically moves older emails (e.g., messages older than 6 months or 1 year) out of your online mailbox and into a local .pst file saved on your computer's hard drive. When this happens, those folders vanish from both webmail and other devices.
    
2. Local OST/PST File Separation: When switching server settings or re-configuring an IMAP account in Outlook, Outlook creates a fresh .ost cache file. Your older messages may still reside in the previous .ost or .pst file stored locally on your hard drive.
    
3. IMAP Folder Root Path / Subscribed Folders: Outlook may sometimes fail to subscribe to or display deeply nested subfolders (such as Accounting > Receivables > 2025) until folder synchronization is refreshed.

Step-by-Step Recovery & Fix Guide

Step 1: Check Webmail First (webmail.yourdomain.tld)

• If the folders are visible in Webmail: The data is safe on the server. You simply need to refresh your Outlook folder subscription (Right-click Inbox in Outlook > IMAP Folders > Query > Subscribe).
   
• If the folders are missing in Webmail: The emails were either archived locally by Outlook into a local .pst file or moved to an offline archive folder on your computer.

Step 2: Locate Local .pst and .ost Data Files on Your PC

1. Open Microsoft Outlook on your computer.
2. Click File in the top-left corner > Account Settings > Account Settings...
3. Select the Data Files tab.
4. Look for files named Archive.pst, Outlook.pst, or secondary account files.
5. Highlight a data file and click Open File Location... to view the folder on your computer's hard drive.

How to Open an Archive File in Outlook:

Go to File > Open & Export > Open Outlook Data File (.pst). Select your archive file. It will appear in your left-hand Outlook sidebar under a separate section called Archives or Outlook Data File, where you can drag and drop your missing folders back into your main inbox.

Step 3: Review & Disable Outlook AutoArchive (Prevent Future Missing Folders)

1. In Outlook, click File > Options.
2. Click Advanced in the left sidebar.
3. Under the AutoArchive section, click AutoArchive Settings...
4. Uncheck the box that says Run AutoArchive every X days.
5. Click OK to save your settings.

Step 4: Server Restore Options & Important Warnings

CRITICAL BACKUP WARNING BEFORE SERVER RESTORATIONS:

Restoring a mailbox from a previous backup date reverts the mailbox back to its exact state on that date. Any new emails sent or received after the backup date will be overwritten and permanently lost.

Before requesting a server restoration:

1. You must export a backup of your current mailbox locally (File > Open & Export > Import/Export > Export to a file (.pst)).
2. Confirm in writing to our support team that you have backed up your current data and authorize the restoration.

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