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Outlook ost file username is in use and not available

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Outlook is an email and calendar software available as part of the Microsoft Office suite. It allows you to send and receive email messages and keep track of your task. It uses an OST file which is an Outlook data file when you have an Exchange account and want to work offline. From time to time, users have seen the “File with username ost is in use and not available” error when starting Outlook. If you are also facing this error, then in this article, we have suggested several ways to fix this error.

What causes the username of the ost file to be used and cannot be accessed in Outlook?

If you encounter the message “Outlook username.ost is in use and not available”, there can be several reasons for this error. We have listed some of the reasons below.

  • This happens if the .ost is still in use or locked by another process.
  • This may be due to a conflict between the Outlook application and other files.
  • This can happen if Communicator, ucmapi.exe, etc. processes are running in the background.
  • This error can also occur due to a lack of synchronization between the OST file and the Exchange mailbox.

Outlook file with username ost is in use and not available

If you see that the username.ost file is in use and cannot be accessed when you log in to Outlook, then here we have given several ways to solve this problem:

  1. Reboot the system and router
  2. Disable Cached Exchange Mode
  3. End All Outlook – Related Task
  4. Repair OST File with Inbox Repair Tools

Let’s use this method one by one to fix this error.

1]Reboot your system and router.

Restart your computer and internet connection and see if that helps.

If possible, use a different internet connection and take a look.

2]Disable cached exchange mode

If restarting the system doesn’t fix this error, try disabling Exchange caching. mode to fix this issue. This will help users work offline in Outlook. Now follow the steps below to disable this option.

  1. launch Outlook and click on file in the top left corner.
  2. To choose Account Settings and click on Account Settings.
  3. Go to Email and choose your account.
  4. Press change.
  5. You will now see offline settings.
  6. Clear the Use Cached Exchange Mode check box.
  7. Restart the Outlook application to save the changes.

Note. Don’t forget to enable “Use Cached Exchange Mode” if this error persists.

3]Quit MS Outlook and related application

If the above methods do not help, then you can try closing or shutting down MS Outlook and its related applications. You must ensure that no Outlook application is running in the background. Now follow the steps below to do so.

  1. Go to the Windows search bar, type “Task Manager” and open it.
  2. Go to process.
  3. Look for the Communicator, Outlook, Teams/Lync, or UCMAPI name.
  4. If you are getting any options related to the application mentioned here.
  5. Then select them and click on End bottom right.
  6. Now reboot your system to save the changes.

Try opening Outlook again. Hope it works fine now.

4]Repair the OST file using the Inbox Repair Tools.

When all the methods shown above fail to solve the problem related to the OST file, it is possible that your OST file is corrupted. In this case, you need to repair the OST file with Inbox Repair Tools. Microsoft has provided an Inbox Repair tool that allows you to recover a folder and items from an offline folder or .ost files. It also helps to recover items from damaged personal folders or .pst files.

How to fix Outlook OST not opening?

Here are a few steps to fix Outlook OST file not opening. It:

  1. Kill all Outlook related processes
  2. Disable Cached Exchange Mode
  3. Uninstall and reinstall the latest version of Outlook.
  4. Disable Outlook ads that may cause conflict

How to fix Outlook data files that can’t be accessed?

If you want to fix Outlook data files that you can’t access, try these fixes.

  1. Restart Outlook
  2. Check account settings
  3. Check your internet connection
  4. Create a new account profile
  5. Setting up an email account

How to convert OST to PST file in Outlook?

If you want to convert an Outlook OST file to a PST file, please follow the steps below for manual conversion.

  1. First, open Outlook and click on File in the upper left corner.
  2. After that click on Open&Export and choose import/export.
  3. Now select on Export to a file on the Import and Export Wizard window page and click next.
  4. Now choose Outlook Data File (.pst) and press again next.
  5. Now select whether to export a specific folder or the whole account and also check include subfolder box > click next.

Outlook username.ost file is in use and not available

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