The server did not recognize your user name or password for account

Same issue, for months. Removing the calendar and creating a new one works briefly, then the error reappears. So far, all remedies have been temporary.

I was curious, so I performed a sync test by entering a new event on both iCal and MobileMe. The event entered in iCal would not sync (and earned the error message). The event entered in MobileMe synced immediately.

Thus, the error message is provably incorrect. Something unrelated to user ID and PW is going on.

That was one of the many problems I had recently. I exported all my calendars as .ics files to back them up (I also had Time Machine backup), then went into iCal/Preferences/Accounts and deleted my account. Everything disappeared from iCal. Then I created a new account, with the same username and password and imported the calendars I had exported previously. I had to resubscribe to the subscribed calendars. Also, be sure to turn automatic syncing off in MobileMe preferences in System Preferences (change it to manual temporarily) before doing this, just in case.

If you decide to try this, be sure to first export your calendars from iCal by going to file/export.../export.../[yourcalendarname].ics, because they will be gone once you delete your account and you'll need to import them. It also can't hurt to have an extra backup in place, like Time Machine or on a thumb drive.

Not sure if this was the best way to fix it. Maybe someone else knows an easier way and will post about it.

I'm still getting error messages on the Mac Pro (which I haven't done this on yet), but the MacBook Pro and iPhone are working and syncing fine now.

Thanks for the suggestion. I had backed up the .ics files and created an iCal archive, planning to then reinstall iCal from the system DVD. When it would not let me reinstall JUST iCal, I sensibly got cold feet and decided to think it over awhile first. I can't count the number of times I've done something logical only to have it backfire.

I thought about doing it that way too! Great minds think alike. I used to use an app called Pacifist to extract individual apps from my Mac install CDs. I have Pacifist version 1.6 from 2003. Don't know if it's been updated lately.

AHA! A Google search showed that it has and it works on Leopard to boot! Cool! http://www.charlessoft.com/ It's up to version 2.6.4 now! That's how long it's been since Apple screwed up an update this horribly, which is a good thing.

Time to update Pacifist. 🙂

I had the same problem. I was able to solve it by going to System Preferences and logging out of MobileMe.

I then logged back in making sure to use my xxx@me.com email rather than xxx@mac.com email.

I was then able to enter the account password in iCal Preferences and the password was retained and my calendar would sync to MobileMe.

Hope this helps others, too.

Seems I fixed it by going to Keychain Access (Applications/Utilities) and deleting the iCal password item there (search for 'cal.me.com' in Keychan Access, just delete the item).

After that I could start iCal, enter my password and it was saved, syncing started again.