How to Fix “Username.ost is in use and cannot be accessed” Error in Outlook 2016?

An OST file is a replica of user mailboxes on Exchange Server, which is saved on the system. These files are known to have different errors or issues like “OST is in use and cannot be accessed”. If you are having these errors, you are at the right place. We will discuss it with some methods.

 

If Cached mode is turned on in your Microsoft Exchange server, it creates a replica of mailboxes and stores it in the system with .ost extension. Even if network is gone with Exchange Server, we can keep working with mails. There are various issues related to OST file corruption which could face ‘File is in use and cannot be accessed error.

Here are some of the main causes of error –

  • Some conflicts happened in MS Outlook.
  • Synchronization error between Exchange Server and OST
  • Accessing same OST by several users.
  • Slow connection and unreliable connectivity
  • Unauthorized access to OST file
  • Outlook process like LYNC, Office Communicator 2005/2007 running in background

Here are some of the methods to resolve the error “OST in Use and Cannot be accessed”

After detecting the error and knowing the reasons behind the same, this error can be fixed in next step. Here are some of the methods to help you know how to fix this OST error.

 

Close all Outlook based Processes

One of the best steps which can help you fix the errors related to inaccessible files is stopping the background process of MS Outlook. Here are the steps to do the task –

  • Close the MS Outlook properly.
  • Go to Task Manager by right clicking on Taskbar.
  • Choose the tab ‘Processes’
  • Search ‘Communicator’, ‘Lync’, ‘ucmapi’, or ‘Outlook’
  • If you choose any of them, choose process and click the button ‘End Task’.

 

Method 2 – Disable Cached Exchange Mode

You simply have to disable cached Exchange Mode with the following process in this method –

  • Open ‘Control Panel’ after selecting Outlook and choose ‘Mail’
  • Choose Email tab by clicking Email Accounts button
  • Click on ‘Change’ by choosing Email ID
  • Unselect Use Cached Exchange Mode > Next > Finish

 

Method 3 – Disable Outlook Add-ins

Add-ins are used to improve overall functionality of an application, whether it is Outlook or anything. A lot of faulty add-ins can make your application working weirdly. So, we need to disable such add-ins which can harm your Outlook or its files. Simply start Outlook in safe mode to disable those add-ins. Type Outlook/safe in Run command box in Windows. Click “Yes” if it asks “Do you want to start application in Safe Mode?”

 

Method 4 – Run Scanost.exe

This method is usually preferred to fix ‘OST file is in use. The file cannot be accessed” error to make OST file readable.

  • First of all, open Scanost.exe
  • Go to Mailbox>Select Repair Errors>Begin Scan
  • It will take few minutes to scan and fix the error in Repair process.

Be sure to use this method if you have Outlook 2007.

 

Method 5 – Using Professional Software

It is one of the most user-friendly, safe and recommended methods. You can quickly repair corrupt OST file with a professional tool. You can simply download OST Recovery Tool which is result-oriented and reliable tool. It can recover all your data from damaged or corrupt OST file. You can also save the data after recovery in another format like DBX, PST, EML, MBOX, and MSG.

Conclusion

You can easily use of these methods explained in this article after detecting the error with the cause. You need to fix the error ‘File Username.ost is in use and is inaccessible to keep working with emails. OST Recovery tool is the best choice for better and quick solution for OST to PST Conversion and to Open Corrupt OST file.

How to Migrate OST files to Outlook PST Files?

OST to PST Converter Tool to Repair inaccessible OST data and recover all objects of OST format along with contacts, messages, draft, task, emails with attachments, notes, tasks, calendars items, and journals etc and convert into New PST formats. OST Data Move every extracted data from OST to Outlook PST File in accurate messages formats. For doing so it has different recovery modes like standard mode, advanced mode, and deep mode. One of the Perfect OST to PST conversion Tool to recover any corrupted OST Data. With the help of This OST to PST Conversion Software users safely retrieve their permanently deleted OST data into cloud-based application Office365 and live Exchange server. OST Converter Tool that quickly recover emails from OST Data and convert OST to PST format. This Converter Tool is available for converting and recovering corrupted MS Exchange OST file database. Advanced tool for ost to pst and few more other file extensions of OutLook and windows versions. Use For overcome in this grave situation you should use OST to PST Converter Tool to instantly recover OST file data with its all attachments into PST, MSG, EML and HTML file formats.

Features:
1) Convert OST to PST in Just few Steps
2) Show Preview of Converted Emails in Trial Version
3) No restriction on file size
4) Easily arranges all the scanned messages based on To, From, Date, Subject, Attachment, Type and Importance
5) Shows preview of messages in 3-pane view after conversion
6) Saves converted emails as EML, MSG, RTF, PDF and HTML format
7) Conversion of contacts, emails, calendar entries and journals
8) Easily arranges all the scanned messages based on To, From, Date, Subject, Attachment, Type and Importance
9) Supports MS Office 2000, 2002 (XP), 2003, 2007, 2010, 2013 and 2016 (both 32 bit and 64 bit)
10) Compatible with MS Outlook 2016, 2013, 2010, 2007, 2003, 2002, and 2000.

Why Use OST to PST Converter?

MS Outlook is a marvelous email client which is designed according to the needs of organizations and to fulfill all the needs of communication. It gives users with the privilege to work offline and it saves all the processes in OST files. When Exchange Server and Outlook come back in identical state, all the OST emails can be mounted. There are some circumstances occur when your important data in OST files can get corrupt. This is the situation you need OST to Outlook PST Converter.

Sophisticated Algorithm & Interactive GUI

OST to PST Converter is developed with cutting-edge methodology which ensures feasible recovery of inaccessible OST files and exports the whole data into PST file format. This professional tool repair the corrupt OST file and forms it in importable PST file. It now comes with enhanced and amazing functionality. It throughly scans the OST files and converts them into PST, EML, MSG, OST, HTML, RTF, and PST file formats.
On one hand it is very efficient to export OST files into PST, it gives users with the option to choose ideal format for conversion on the other side. In order to recover OST files, it has no limitation for size and it can repair OST files of unlimited size and gets the data to PST. With this conversion utility, you can remove all the corruption issues and extract OST files in ideal way.

How can get your data back with OST Recovery tool?

This explicit OST converter Tool first performs deep scan of all your email items and convert it into PST format which is easily accessible by MS Outlook. In this way, you can always stay connected with your clients, stakeholders and your corporate unit. If you want to buy this tool, we recommend you to get started with free trial version to measure its capabilities and then you can buy this tool to keep with you forever. In free trial version you are eligible to see the preview of repaired or converted OST Emails.

Functionality to Find, Save and View

Once the scanning and emails and various data are given in preview pane, you can view, find, and save a lot of emails according to criteria, like To, From, Date Field, or Subject. When you click the link of ‘Find Message’ you will find a lot of results. When you enter your details and to choose the date filed, check mark the message. When you have given all the details, you can click ‘Search Now’ and then the tool will give you the list of all mails as per the details given. Right click the messages and options will be given to you, like ‘save as EML’, ‘Save as MSG’, ‘Save as HTML’, ‘Save as RTF’ etc.