[Solved] How to Fix “OST is in use and cannot be accessed” Error? admin, August 8, 2023August 12, 2023 Outlook users are very much aware of the importance of the OST (Offline Storage Table) file. You can use it even if you are not online with the Exchange server but synchronization takes place with the Server mailbox only when Exchange connectivity is there. Outlook users need to depend on OST files whenever there is an issue with the exchange server. OST file is formed when you configure your account with the exchange server with cached exchange mode ON. But the OST file has also some disadvantages to the users as OST file is the data stored on the server and sometimes it leads to OST file corruption and you may get errors like “OST is in use and cannot be accessed”. There are so many errors related to Outlook OST files, such as – Rending reported Error (0x800ccc0f) Outlook Error Code (0000000E) Outlook Synchronization Error (8004011d-526-80040115-0) Some reasons behind OST data file corruption Power failure Server down Virus attack software problem Hardware problem Synchronization issue Anomalous termination of Outlook Issue in internet connection These reasons do not allow the users to access the OST file which sometimes shows you an error message Outlook OST is in use and cannot be accessed. This type of message is the indication that the OST file has corrupted and it is too difficult to access it. It becomes a major problem when you urgently want to access some important OST data but you cannot be able to do so as it gets corrupted. So for that, you need to repair the OST file. How to Repair a Corrupted OST File? There are ample of software available which you can download accordingly to your need. Some software provides a free demo version so that you can run and check its reliability. If you like using the software you can even buy it. MailsSoftware OST to PST converter is a third-party software that is the ultimate solution to fix the error of Microsoft Outlook “OST is in use and cannot be accessed”. This software allows you to get back inaccessible data in accessible form converting it into PST format. It also maintains an OST mailbox arrangement providing you with the exact recovery of data. The most trustworthy solution which can easily repair the OST data without any hassle. You just need to add OST file to the software which automatically recovers the data and provides you with a preview of it. Conclusion In this blog, I tried to discuss the error in the file “OST is in use and cannot be accessed”. The reason why we get this error message and how to resolve this. Outlook