MS Outlook shops a synchronized copy of your mailbox out of your IMAP, Workplace 365, and Change or Outlook.com accounts in your native laptop storage as an offline file. That is known as Offline Outlook Information file . Right here, .ost is useful to entry all of your beforehand saved emails, contacts, calendar, duties and many others. each time a connection to the mail server is just not obtainable or web is disconnected. You may as well learn and compose emails, create calendar entries or add contacts to the file. All these adjustments within the .ost will routinely synchronize with the server when the web connection restored. Till then, emails will not be despatched. This is the reason the .ost is essential for Outlook customers and so, any state of affairs is worst if Outlook fails to entry information on account of completely different causes. That is so annoying if any Outlook error will get an error message The file C:UsersNameAppDataLocalMicrosoftOutlookxxxx@e mail.com.ost is in use and can’t be accessed. Causes for this error message Multiple consumer making an attempt to entry the .ost. Drawback with the web connection. Some other utility conflicts with Outlook. Synchronization problem with the mail server. Corruption or harm within the file. Fixes for this error message In accordance with the error message .ost file is used and can’t be accessed the primary answer involves thoughts is to shut the opposite utility which is utilizing the .ost. However, a lot of the occasions this answer would not work and Outlook user-facing identical error many times. Additional, this text describes extra correct strategies to repair this error with the ost. 1st Technique- Use Inbox Restore Instrument to restore ost file: Microsoft Workplace comes with an inbuilt software known as Inbox Restore Instrument or SCANPST.exe (In older variations of workplace there’s a separate SCANOST.exe software to restore OST) to restore corrupt Outlook information information. You could find this software within the Workplace set up folder. Run SCANPST.exe and open Inbox Restore Instrument. Browse and choose the .ost. Click on on Begin to scan can discover the error with the file. Now click on on Restore to begin the repairing course of. After the restore course of full click on OK. Notice: This utility unable to repair this error at all times as a result of this software is just succesful to restore some minor damages in ost. 2nd Technique- Flip off Cached Change Mode: By default, Cached Change Mode is on which permits Outlook to avoid wasting a replica of your mailbox as ost file. Therefore, typically turning off Cached Change Mode repair this error. Go to File > Account Settings > Account Settings in Outlook. Right here choose your e mail account and click on on Change. Beneath Offline Settings uncheck the Use Cached Change Mode. Exit and restart Outlook. third Technique- Convert inaccessible ost file to an accessible pst: If the primary two methodology fails to resolve this error then the perfect and most correct answer is to transform the .ost to the pst. This answer ensures the repair the unable to entry ost file error. Conversion of ost to pst is well potential with a third-party OST to PST Converter. These instruments are very superior can succesful to restore and get better any sort of main corruption within the .ost. After recovering of mailboxes from the corrupt file, this software program can convert .ost to a pst which can also be an Outlook information file sort. As solely a pst is immediately importable in Outlook you may simply open this pst with outlook with none getting any error message and entry all of your emails and different information.