Cloud migrations can be painful. Part of the pain with migrating to Office 365 is getting ALL of the company email into the cloud. Active users are typically easy as there are endless methods for migrating active users. But what about companies that have archived and\or offline email? Trying to manage them locally on PCs is cumbersome and risky. Opening them over the local networks is slow and unstable. We need a method to upload PSTs into shared mailboxes where we can easily attach them to other mailboxes using Office 365 memberships. This blog post is how you should upload PST files into Office 365 mailboxes.