Outlook shows up an error stating that the user is not authorized to use the PST file and they immediately panic without considering the situation as resolvable. The error we will be discussing here looks like the following:
"You May Not Use The File. There is Not Enough Permission to Use PST Files"
The Cause of Occurrence: The error is displayed at the time of importing an Outlook PST file from an external storage media to the Microsoft Outlook profile of a different machine. This happens because; the file being imported comes from a different operating system to a different one. Therefore, there is a possibility that the source and destination OS accounts are not compatible or the controls have not been set properly.
Nevertheless, the issue is absolutely resolvable with the help of troubleshooting methods. Two of the methods are discussed in the segment here and requires to be followed out as suggested.
TIP: Note that applying both of the mentioned fixtures could result in making the respective machines vulnerable to attack. Thus, make sure that you consider the consequences as well as have taken alternative measures to make sure the security is not compromised with.
Method 1: Change PST File Permission
Method 2: Change Account Controls for PC
NOTE: There is a possibility you might be prompted for an Administrator password.
TIP: Once the changes made to security settings of PST file and User Account resolve the import trouble, reverse the changes to keep your essential data protected. This will protect your data and computer from being attacked by malware all over again.
Conclusion: Changing the security setting of either the PST file or the computer may result in making it vulnerable to attack. Therefore, changing the settings back is an important step of the procedure. However, if this doesn't solve your problem, then you may try other possible solutions like recovery of the database for the slight possibility that it may be corrupt.