Synchronize PST Files and Solve the Issue: To solve this issue
, you may synchronize multiple folders and synchronize PST files into single file. The process to merge Outlook files will cut down on the number of PST files or Personal folders present in your mailbox, thereby, giving you a better and easier mailbox management. The process to merge Outlook PST can be performed using some third-party PST merger software like SysTools PST Merge tool, which is an Outlook merge tool. Even if you don't posses expert technical knowledge, you can still merge Outlook files using this tool. Thanks to the very user-friendly interface of this tool. Merge personal folders and take control of your Outlook mailbox once again. Don't wait to perform this process to join PST files as delaying this might cause other serious problems.