The major differences between the original X10 Mini and X10 Mini pro is the replaceable battery, and the pro having slightly larger dimensions (3.5 × 2.0 × 0.7 inches opposed to 3.3 × 2.0 × 0.6 inches).

Both handhelds lack Sony Ericsson's "Mediascape" media-management software, but include "Timescape" as well as the proprietary "Rachael" UI.

The X10 Mini/Pro (as well as the X10) originally ran Android 1.6, with an update to 2.1 being rolled out from Sunday 31 October 2010, to Tuesday 30 November 2010.

[6] The updated Xperia X10 Mini/Pro is more responsive and faster when compared to older Android version 1.6.

[7] These updates require rooting of the phone (which has warranty implications) and potentially flashing of a third-party kernel.