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I checked Dell's site and it looks like the X51 series is supported by WM2003SE. Also to note is that the X51 series is essentially identical to that of the X50 series, hardware wise. You'll need a ROM from Dell in order to downgrade. Looking at what's available for download from their site does not show any ROM downloads for the X51 series under WM2003.
I also took a look at ACT!'s website and found that ACT! Link is now compatible with ActiveSync v3.5 - v4.1. It still does not support WM5.
In my opinion, it would be a shame to have to downgrade your Axim to support one app. However, the decision lies with you. I'm not sure if this is a critical app that you use. If you can contact ACT! and see what their timeline is to get a version out that does support WM5 you may not have to wait that long.
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