Hi ​@Bobby, 

Welcome to Box Community, and we’re glad to help! 

Box Drive does not support syncing or recognizing Outlook PST files. These file types are blocked by Box Sync and Box Drive and cannot be synced even if they are in a synced folder. 

As of this message, there is no information in the provided documents indicating any planned future support for PST files in Box Drive.

We suggest on using the Box website to upload these file types. And in the meantime,  please send your feedbacks or feature requests to our Product team via pulse.box.com. 

Thanks for posting!