I would imagine that even if true, it simply means that OExpress will not be developed further. Since it's a pretty simple email client only, that wouldn't worry me too much.
If it does what you want, why change. It's free - and outlook very definately isn't free.
If you have a desire to try a newer email client, Thunderbird is free, very good, better than OE and you're not reliant on MS. click here