You cannot PST after Cancelling Password Prompt

A password-protected PST file prompts a password dialog box, each time when you try to open it. If you cancel this prompt, the further mail operations will not proceed. However, if you have lost this password, you should look for powerful Password Recovery solutions that could recover it for Outlook.Consider a scenario, when you try to open a password protected Outlook personal folder or open Outlook when using PST as your default delivery location. The password prompt appears, but you cancel the prompt, probably because you don’t remember the password. Later, when you click to open, expand or view properties of this PST file, you come across these error messages:
“Unable to display the folder. The server is not available. Contact your administrator if this condition persists.”

Or

“The set of folders could not be opened. The server is not available. Contact your administrator if this condition persists.”

Or

“Unable to expand the folder. The set of folders could not be opened. The server is not available. Contact your administrator if this condition persists.”
Cause

You haven’t specified the password that a password protected PST file requires to access its full contents.

Solution

To remove these errors, you need to enter correct PST password. For this, restart Outlook and try to open the same PST or start Outlook. You will receive a password prompt to enter the password.

There are several situations when you don’t have access to your PST password. This occurs if you forget it or you lose the note or file that you used to save password(s). In such cases, you cannot access your PST file contents. Thus, you can select ‘Save this password in your password list’ option of ‘Personal Folders Password’ dialog box at a successful attempt. Outlook will not prompt you for any password, the next time. But using this option can raise some security concerns.

For recovering lost PST password, there are several PST Password Recovery software available. These are exclusively built Password Recovery keys for Outlook that can recover your lost or forgotten PST password while maintaining the original data and view.