I changed all my password, hotmail & gmail account.
I update my Zimbra desktop accounts in order to use these new password.
For the hotmail Account, there is no problem.
For the gmail account, I receive now a popup which prompt me for a new password, but when I put it, I have a error GDATA.Invalid_credentials.
BUT : Although I have these error message, Zimbra desktop still manage to retreive new emails from my gmail box, the error seems to appear when I click on the send/receive button.
I don't want to suppress these account as I have some mail that are no more online.
PS / It's not a password mistake, I update several other mail client in the mean time with no problem (tablet, phone...)