Read mail showing as unread

In my inbox,1) After read mails it became unread (black color), but after some time those mail becoming unread(red)agin. I have checked that there is no failover happent in the clustor. Theres are no special agents running on the mail box.

  1. After mooving some mails to a folder, after some time those mails coming back to my inbox.

User is using local replicated mail copy of mail file and there is no issues with mail replication

Server: 8.0.2

Client: 6.0.1

These are two issuies I have been facing.

Please give me your ideas…!

Thanks in Advance

Smitha Mary