They have sms with outlook 2007 aswell but i know it's more polished in 2010.
I can only see them doing an intergration if you have a mobile internet dongle and thats a very big if! They already have thier own SMS client with the bundeled software. Plus they offer SMS messages online too.
Also if you were thinking of getting your phone messages sent to your PC; I dont think thats possible as it would require to replicate the phones protocols at the same time!
Unless there is a huge demand for this (I don't think there would be), then i'm not sure o2 would put in the effort!
I would like this functionality as well. It is easier to type on my PC than my phone...I have unlimited texts on my phone, O2 broadband with 500 texts per month via web. Integrating Outlook with the O2 SMS gateway would seem to be an excellent way to text lots of friends quickly.
I don't think this is something that o2 would be looking to implament. The general demand wouldn't be that high. Also, it opens up the possibility of putting extra strain on the network with customers and even businesses using personal sims to text hundreds of people at once - it's very open to excessive use if the account has unlimited SMS.
Hate to say it, but that type of functionality is directed towards the corporates who can afford to run the service over the long term. As above, consumer wise it would be become expensive and not of use to those who don't have Outlook. I agree though, it is useful thing to call on even as a PAYG service.