conversion from ost to pst

I’ve been working on OST2PST, a C++ tool that reads an Outlook OST and creates a Unicode PST without requiring Outlook, MAPI, an account, or network access. It includes a portable Windows GUI and a CLI. In one recorded run, it converted a 26.25 GB OST to a 22.98 GB PST in about 32 minutes, with...

I need to test and confirm best way to take backups of Outlook email account folders so that they can subsequently be imported back into Outlook and the user can then read all the old emails without connecting to the email account when it is later deleted from the remote mail server. The whys...