Merge Folders

Merge Folders is a tiny Outlook add-on that should come in handy for users that need to synchronize or combine Outlook, Exchange Server, and Office 365 folders. Folders might get scrambled or desynched for various reasons, such as restoring backups, unintentional transfers, changes to the folder and subfolder tree, or unforeseen migration side effects.

Even though it integrates with outlook, Merge Folders sports a standalone interface, which offers a quick way of selecting and merging two folder instances.

In case you're using multiple machines for a single account, synchronizing folders might be the best solution to centralize and organize your items tree. 

The add-on should help you with duplicate filtering, meaning that you can sync your emails without getting overwhelmed by copies of the same entry. 

The Command line can also be employed to execute tasks like merging, transferring, or migrating emails between Outlook and Exchange Server folders. In a nutshell, if you are handy with CMD, you can put it to good use.

To sum things up, Merge Folders looks like a neat add-on that can help you get your emails in order, especially if your folders/subfolders are all over the place. Moreover, being able to run this utility from inside Outlooks layout, CMD, or its separate UI brings a lot of flexibility to the table, so give it a try if you need this type of assistance.