Can't send messages to mobile devices.

[Ulysses]

Hi,

I've been using MSN version 6.2 for a while now, and always made sure to update it when needed. I used to enjoy the text message to mobile devices feature, but it's been about three weeks since every time I type a message and hit "enter", I get another message saying that my txt couldn't be sent since I need to update my MSN...and I get a link at the end of this message which takes me to the main MSN download page. I tried redownloading messenger, I even tried the "repair feature" that appears when you're installing the software anew. Nothing woked. I seem to be able to receive text messages from mobile devices to my MSN but not viceversa. I also tried to log in using a new account, but it won't make any difference.

Can someone please tell me what's going on, and help me solve this problem?

Thank you in advance.