Increasing the size of a PST file.

[le Pingouin]

Apparently there are two different PST file formats - an older one using ANSI encoding which has a limit of 1.9GB and a newer one using Unicode encoding which has the 50GB limit. Perhaps yellowtriumph's PST is using ANSI having come from an earlier Outlook version?

https://support.microsoft.com/en-us/...iles-in-outloo

Here's how to tell which format you have: https://www.slipstick.com/outlook/co...nicode-format/

Methods for converting ANSI to Unicode: Convert an ANSI PST to a Unicode PST