What does the Outlook Data File Cannot be Configured Error Mean?
Outlook shows this message when it cannot open, create or trust the data file that belongs to your profile. The file can be an OST file for a server account or a PST file for a local archive.
The usual causes are a damaged or missing data file, a full disk and a broken Outlook profile.
| Cause | Sign | Fix |
|---|---|---|
| Full disk | Outlook fails while it creates the file | Free disk space |
| Damaged OST file | Server account fails at startup | Rebuild the OST file |
| Damaged PST file | Archive or POP account fails | Inbox Repair Tool |
| Broken profile | Error returns after every fix | New profile |
A different message has its own guide. See Outlook unconfigured data file error for that one.
How do You Free Disk Space for the Data File?
Method #1: Free Disk Space (Free)
Who it suits. Users whose system drive is nearly full. Extra application. None.
- Open Disk Cleanup from the Start menu.
- Select the system drive.
- Tick temporary files and the Recycle Bin.
- Select OK and then Delete Files.
- Start Outlook again.
Outlook needs room for a new OST file. Large mailboxes need more space than the size that the server reports.
How do You Rebuild a Damaged OST File?
Method #2: Recreate the OST File (Free)
Who it suits. Users with Exchange, Microsoft 365 or IMAP accounts. Extra application. None.
- Close Outlook.
- Press Windows key + R, type %localappdata%\Microsoft\Outlook and press Enter.
- Rename the OST file so it ends in .old.
- Start Outlook. Outlook creates a new OST file and syncs your mailbox.
Microsoft states that an OST file is a copy of your Exchange data, so you can create a new copy at any time. Our OST file guide explains the file in detail.
Heads Up. Rename the file and do not delete it. The old copy is your only source when the server account is gone.
How do You Repair a Damaged PST File?
Method #3: Inbox Repair Tool (Free)
Who it suits. Users with POP accounts or archive files. Extra application. None, because SCANPST.EXE installs with Outlook.
- Close Outlook and copy the PST file to a safe folder.
- Open SCANPST.EXE from the Office16 folder for Outlook 2016 and 2019.
- Select Browse and choose the PST file.
- Select Start and then Repair if errors appear.
- Start Outlook with the repaired file.
Microsoft documents the tool on its support page. Use our PST repair tool guide when the Inbox Repair Tool fails.
How do You Create a New Outlook Profile?
Method #4: New Profile (Free)
Who it suits. Users who still see the error after Methods 1 to 3. Extra application. None.
- Close Outlook and open Control Panel.
- Open Mail and select Show Profiles.
- Select Add and name the new profile.
- Add your email account and finish the setup.
- Select the new profile as your default and start Outlook.
A new profile creates a fresh data file, so the old profile stays as a backup. Remove it only after you check your mail.
What if the Account or the File is Gone?
Move the damaged OST file out of the profile folder and open it with an OST tool. The OST extractor tool guide lists options that export mail to PST without the server account.
Frequently Asked Questions
What Causes the Configuration Error?
Damaged OST or PST files, a full disk and a broken profile cause it. Outlook cannot create or trust the data file.
Does Recreating the OST File Delete My Mail?
No. The server holds your mail, and Outlook downloads it again into a new OST file.
Can the Inbox Repair Tool Fix This Error?
Yes, for PST files. Microsoft lists it for files Outlook cannot open.
Should You Delete the Old OST File?
No. Rename it so it ends in .old. Delete it after you confirm that the new file works.
How Much Disk Space does Outlook Need?
Large mailboxes need room for the OST file, and Microsoft states that it grows 50 to 80 percent larger than the server mailbox.
Why does the Error Return After a New Profile?
The new profile can still point to a damaged file or a full disk. Check the data file path and the free space.
Is This the Same as the Unconfigured Data File Error?
No. The messages differ, and both have their own causes and fixes.
Author's Verdict
Start with disk space and the OST rebuild, because they fix most server accounts in minutes.
Repair the PST file next, and create a new profile last. Rename files and never delete them early.
Key Takeaways
- Damaged files, full disks and broken profiles cause this error.
- A new OST file downloads from the server.
- Inbox Repair Tool fixes many damaged PST files.