Microsoft Outlook 2010 is the current version of Outlook. So many outlook users, who use its earlier version, are upgrading to Outlook 2010. Microsoft has provided easy Outlook upgrade to its users. But some of the users have experienced several kind of problems while using and upgrading to Outlook 2010. When you try to use your older PST file in upgraded Outlook 2010, .pst file asks for password. However, you have not protected your older pst file with any password. It means pst file suddenly password protected as you try to import or use the file.
This is a critical issue with outlook pst file. When you create new pst file, it works fine and doesn't asks for password. The reasons of pst file suddenly password protected may be corruption in the file. When the pst file gets damaged or corrupted, it becomes inaccessible. It behaves unexpectedly and thus pst file asks for password. There are several cases of corruption or damages in pst file such as:
In order to resolve pst password issue, you should repair the pst file with Scanpst.exe i.e. Inbox Repair tool. Before you start repair, you make another copy of the file. If the problem still persist then try using the pst file in another PC where Outlook 2010 is installed. If the pst file doesn't ask for password and works fine in another PC then there is problem with your Outlook 2010 installation. Hence, you will have to reinstall Outlook 2010, create new profile and then try using the pst file.
In case, your older pst file asks for password and doesn't work in another computer too, it means the pst file is severely corrupted. In this circumstances, you will need powerful PST Repair tool. You can use third party PST Repair tool which is extremely powerful than Inbox Repair tool. You can easily recover your corrupted pst file fix 'pst file suddenly gets password protected' issues.