Running messenger 8. been using it for a while without a problem. Suddenly when i send a message to a UK mobile i get the following message:-

"This message was not sent because messages can't be sent to this contact's mobile service provider. View a list of providers that support mobile messages"

This is happening wil all my numbers, can anyone suggest how i resolve it

Call your own mobile SP and ask them what they are playing at. I suspect that this is "a strategic withdrawel of service facilities" - in other words they don't make any money out of the calls so they have stopped access through MSN. B*st*rds.
I assume you are in UK - post what you find out please?

Sorry yes i am in the UK