April 4th, 2020
February 19, 2021
Whenever Outlook is used with Exchange, then all of its mailbox items get saved on the server locally in the Outlook data files with .ost extension. This will generate errors in OST files such as “the file username.ost is in use and cannot be accessed.” This type of error mostly occurred when Outlook used with Exchange. So, to fix this error, we are explaining some of the essential steps that can be used to correct it.
A replica of the mailboxes that reside on the server is built on the local machine while using Microsoft Exchange with Cached Mode enabled. This replica is stored in Offline Storage Table files, which are data files with an OST extension.
OST files enable users to keep on working even when the Exchange connection gets stopped. Whenever the connection restarts, all the local mailboxes get merged with its server copy.
Now, it’s time to know the main causes behind this error.
Outlook error “the file .ost is in use and can not be accessed” is frequently encountered when attempting to opt for the “Save and Send” facility contained inside Office applications such as Word and PowerPoint. Although the error message shows that another application uses the Outlook OST file, finding the software can be very difficult for users who don’t operate on networked machines.
There could be several other reasons for the occurrence of the error:
Now, after knowing the main causes of this error message, let us see some tricks to troubleshoot it.
Try to ensure that several Outlook instances are not running and that there is no other relevant mechanism that can trigger the OST file to be marked as “in use.”
These manual steps will help you to repair OST files so that the “the file is in use and cannot be accessed Outlook” error will automatically get fixed. But it has some downsides that you may face like complexities, lengthy process, low speed, consume more time, etc. So, to protect yourself from these drawbacks, you can choose the below alternate solution.
OST Recovery program effectively repairs the inaccessible or damaged Exchange Outlook data files without any data loss. This tool developed by an advanced algorithm to quickly repair OST files so that any error related to them gets automatically fixed. You can use this recommended utility for better and instant results without any issues.
All about “the file username.ost is in use and cannot be accessed” error has been explained in this guide including about the error, causes, and manual steps. The limitations of the given manual steps also provided here that a user may face. To avoid these limitations, an alternative way is given that helps to fix the error quickly. Hope you get some useful information through this guide.