Unable to send or receive messages for the Sky account, Server Response: -ERR [SYS/TEMP] Server error

My Windows Live Mail is not receiving emails and is constantly asking for username or password even though I know they are correct.
I then get the following message....

Unable to send or receive messages for the Sky (*********) account. An incorrect password was entered. The next time you send or receive messages, you'll be asked to enter your username and password for this account.

Server Error: 0x800CCC90
Server Response: -ERR [SYS/TEMP] Server error - Please try again later.
Server: 'pop.tools.sky.com'
Windows Live Mail Error ID: 0x800CCC92
Protocol: POP3
Port: 995
Secure(SSL): Yes

On the verge of going to another mail client!!

Many thanks in advance

[Original subject: Windows Live Mail problem]