OK I have managed to solve my problem!
I noticed that before the error came up it seemed to be trying to sync messages in different batches or groups. It would say "Messages: 0 of 12" and go through to 12 of 12 fine and then it would say "Messages: 0 of 29" and would get to 22 or 26 or something and bam, the 8000FFFF error would come up.
I thought maybe it is trying to sync the messages in my inbox first, then sync all the other folders 2nd.
So What I did was create a new folder in Yahoo mail on my pc and moved all my inbox mail to that (all 2000+ emails!).
Then when I sync'd on my phone it worked fine. No error and inbox showed as empty. I sent a few test emails and they came thru fine using manual sync and auto sync. So it must have been a corrupt email in my inbox. They were all legit ones from friends etc and I had previously deleted any with attachments, but I guess there was one that wasn't quite right.
Interesting thing is, when I go to Show All Folders on my phone, the new folder doesn't show up. All my other random folders I have created show up, but not the new one.
So my suggestion is to either delete everything in your inbox on your pc and try sync-ing on your phone. Or if, like me, you need your emails from your inbox, make a new folder and move them all there.
If that doesn't solve your problem, the other thing to try is to delete all your Yahoo accounts on your phone. Then create a new Yahoo email address on your pc (random@yahoo.com) and add that account to your phone and see if you have any problems. If you do, then it's a settings, Yahoo or service provider issue. If there is no problem, add your original Yahoo account to your phone as well and try again. If the error comes up on that account but the new one you created is sync-ing fine, then it must be settings or a corrupt email like me.
Let me know how you get on!
I noticed that before the error came up it seemed to be trying to sync messages in different batches or groups. It would say "Messages: 0 of 12" and go through to 12 of 12 fine and then it would say "Messages: 0 of 29" and would get to 22 or 26 or something and bam, the 8000FFFF error would come up.
I thought maybe it is trying to sync the messages in my inbox first, then sync all the other folders 2nd.
So What I did was create a new folder in Yahoo mail on my pc and moved all my inbox mail to that (all 2000+ emails!).
Then when I sync'd on my phone it worked fine. No error and inbox showed as empty. I sent a few test emails and they came thru fine using manual sync and auto sync. So it must have been a corrupt email in my inbox. They were all legit ones from friends etc and I had previously deleted any with attachments, but I guess there was one that wasn't quite right.
Interesting thing is, when I go to Show All Folders on my phone, the new folder doesn't show up. All my other random folders I have created show up, but not the new one.
So my suggestion is to either delete everything in your inbox on your pc and try sync-ing on your phone. Or if, like me, you need your emails from your inbox, make a new folder and move them all there.
If that doesn't solve your problem, the other thing to try is to delete all your Yahoo accounts on your phone. Then create a new Yahoo email address on your pc (random@yahoo.com) and add that account to your phone and see if you have any problems. If you do, then it's a settings, Yahoo or service provider issue. If there is no problem, add your original Yahoo account to your phone as well and try again. If the error comes up on that account but the new one you created is sync-ing fine, then it must be settings or a corrupt email like me.
Let me know how you get on!