email’s in folder’s

i have outlook 2011 in MAC, and i have a problem with the email messages.

When i move a message from one folder to another, the mail goes there, but 2 minutes later the email comes back to the original folder?!?!

This is very annoying, but i can't solve it. I move the email, and 2 or 3 minutes later the message is in the original folder.

I use OUTLOOK.COM account ( pop3 ), GMAIL account and HOTMAIL account.

Can you help me please,

Thanks

Luis