Increase character limit in a text box that is based on a formula

I have a text box that is set to "=B1". B1 is a cell from an Access table import with memo format. The text memo is long, probably on average between 1000-2000 characters. I have set up the text box to automatically resize for the text, but the text stops at what I assume is 255 characters, even though cell B1 displays the entire memo.

How can I set it up so that this text box (or any other similar shape) displays the text and retains its resize/wrap property?

This is done in Excel 2010.

Hi there,
I'm facing the same challenge, any advice will be appreciated!

Thanks!