We recommend that all email is stored within Nexus, and that users do not export mail to PST archive files.
Outlook data and archive files, known as PST files, can easily become corrupt. These files are not stored within Nexus, and by default are stored on the local hard disk of the machine you configure them on. These files will not be backed up.
PST files should never be opened from a network location. This includes your home drive (H:\).
The use of PST files is also known to cause performance issues during certain operations in Outlook. This can cause the application to 'freeze' whilst it synchronizes the PST file, with issues especially noticeable when you switch into and out of folders that contain numerous items.
If you use Outlook to connect to other email accounts, such as POP3 or IMAP, Outlook will also store these email accounts to a local Outlook data file. We do not recommend that you use Outlook to connect to any other mail sources outside of Nexus.