All items in Inbox dissapears randomly and then starts synchronization again??

My inbox is randomly wiped of all mails newer than apx. 1 year… And then starts synchronization to rebuild inbox from server over again. This happens out of the blue…
Source is from MS. My OS is Win7 Prof.

Hi René, did you lose any data or are all the messages synchronized again?
Are you using POP or IMAP connection with your account? What version of eM Client are you currently using?

Thank you,