Most of times user likes to disable a particular OST file may be because the requirement of that OST file is not there or user no longer uses OST file. So it is better to disable offline outlook data file. You can follow these simple steps to know how to disable OST file.
Step 1. First of all synchronize OST file from offline folders to Server folders. You can use any of the following procedure:
Step 2. After you have synchronized the changes navigate to Tools menu » Click Email Accounts » Click View or change the existing email account » Click on Next button
Step 3. From the name list choose "Microsoft Exchange Server" and then click on Change button
Step 4. A change Email Account Dialog box appears click on More Settings
Step 5. From the "Microsoft Exchange" dialog box select Advance tab and click on "Offline Folder File Settings" button
Step 6. Select "Disable Offline Use" button
This will help you to disable OST file if you have enable working offline mode in Outlook and has made the settings of outlook to prompt you whether you want to work offline or online then you should change this setting now. For this you can follow the below mentioned steps:
You can delete OST file if you want to remove it permanently instead of disabling it.