I installed iCloud on the iPad
K, that wasn't clear in your original posting. You left that part out.
Are you saying this would be fixed if I upgraded to Mountain Lion?
That is not what I said. What I should have said is that the OS requirements for iCloud are Lion & Mountain Lion.
The following are keychain troubleshooting that you may wish to try:
Use Spotlight to search for a file called login.keychain.
Users/YourUserName/Library(which is a hidden folder and won't show in Finder)/Keychains.
Click Go in the menu bar then Go to Folder and type in /Users/YourUserName/Library and hit the enter key. Look down the list of folder and find Keychains. The "login.keychain" file should be inside.
To update this, I seem to have it all fixed now. However, this was not by doing anything, it just suddenly started working again. My theory is that some settings were cached with the ISP and after a few weeks it was refreshed and started working again. Fingers crossed it carries on working like at the moment. *Shrugs*
I have this happen randomly all of the time with the domain at my job and my email at the domain at the school where I do network management. Doesn't happen to any one person frequently, but mail suddenly stops and then just as suddenly starts working. Yesterday my iPhone shut me out of the school mail, this morning it was healed -- I could get the school mail on my laptop just fine the whole time. A trick that might work, or may just keep the sysadmin occupied while the problem goes away on its own, is to go into the settings and change something (i.e. break it), reboot, then go back into settings and reset the thing that you broke.
(You could also try wearing a hat in a silly manner while standing inside a circle playing the clarinet badly -- it works for sea bears <-- silly Sponge Bob reference.)
Interesting.... so in other words Apple Mail has a mind of its own!!
I have only ever had brief times when Apple Mail went funny on me like this, this is the first time it happened for a month and spat out 2 email accounts at same time. I do however wonder in this case whether it was a caching issue since I was also unable to log into webmail for one of the accounts (even though the other was fine).
Good to know other people having same experience that one device is delivering mail fine and other device doesn't even when settings identical.