Discovering an unassociated (uncoupled) PST is not very easy.
The PSTs could be anywhere. They could be on a network share, they may be in a current user location or somewhere that was used a number of years ago. Therefore, you will need to search all server locations. They could be on a local drive, on a desktop machine, a laptop or even on someone's computer at home. This could occur if they were using Outlook from their home computer.
Finding the ones on a server drive should be relatively straightforward, just taking up a certain amount of time and effort! However, finding PSTs on a local drive is virtually impossible without the right application. This is where you need PST management from C2C.
C2C's PST management exists in a number of their products; it provides the ability to locate PSTs on a local drive by scanning the drive(s) from an Outlook session. An Outlook add-in will find the local PSTs and report back to the admin any information on their size and location. It can also report back on the content of the PST such as number of emails, or examine the content of emails and their attachments.
The software depends on users logging in to Outlook, so it may take a few days to gather all the information, but in a relatively short period of time, the admin will benefit from knowledge about all the PSTs and their locations.
Then the issue moves onto the decision about what to do with these unassociated PSTs.