X1 constantly crashing

barneyhaye wrote:

However, on my old PC linked to the same combination of mailboxes I used to have 1.1m emails indexed.

You may have to tell X1 about PST files that are not a part of your Outlook Mail Profile.

If they are standalone PST files, then you can add them through

> Manage Data Sources > Outlook Email > Add PST File...

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