I only have 1 email account, but I have 2 pst files:
Directory of C:\outlook
21/06/2017 12:55 AM 1,277,903,872 Outlook.pst

Directory of C:\Users\Sid\Documents\Outlook Files
21/06/2017 12:56 AM 525,312 Outlook.pst'
In all my previous PC's I have only ever had one PST, and I'm finding it very confusing having 2 PST files... how did this happen? Is it because my new PC is 64-bit?
Is it possible I can just combine these 2 PST files into 1?