Exchange Server corruption is a common scenario is an organizational set up when using MS Outlook email client. Then there are chances of severe corruption that has to be handled with care to avoid any risks to the data stored in OST files. This brings a striking question in your mind is that How to copy OST to PST.
Faulty Message: You receive the below mentioned error message because corruption in them.
"Unable to expand the folder. The set of folders could not be opened. Errors could have been detected in the file xxxx.ost. Quit all mail-enabled applications, and then use the Inbox Repair Tool."
If you convert OST files into PST then you can read and use those unusable OST files for the purpose you want.
Though all these methods can be applied then also if you are unable to get up to the mark results then you can use outside software tool that will help you to solve the matter.
How to Copy OST to PST? If you copy OST to PST, then you can use those unusable OST files without any corruption problem. OST Recovery software will help to copy OST to PST to use them. This solution is a remarkable option to recover OST files as well as to convert them into PST format of Outlook and you will get an appropriate answer to the query how to copy OST to PST.