Is the Outlook OST cache file encrypted?

Is the OST cache file created by Outlook encrypted? I understand that Outlook won't open the file unless it can connect to the user's Exchange account, but I'm wondering if there's a possibility that 3rd-party tools would be able to sift through it and recover anything. Should I store it on an encrypted drive for better security? Has anybody found official Microsoft documentation on this?


Solution 1:

No, it not seems to be encrypted. See here, here and here for some example.