The Zimbra Service is not the Default Store for this profile...

Hi all,
anyone have found the solution at the object problem???
I have 30 client Windows XP with Outlook 2007 SP2 connected to Zimbra Ne 7.1.1 with Zimbra Connector 7.1.1 (I have installed even 7.1.4 version...)
I have single Outlook account

In some clients there are strange email problems: Outlook receive emails but does not send with this admin error:

"The Zimbra Service is not the Default Store for this profile"

I have search other similar forum threads without solution..

Thanks in advances

Problem solved!!!

Problem has been solved using mailbox reindexing!!!