The above error is happening on a number of users mailboxes.

We are running GW 8.02 HP2 on NW6.5 Sp8.

I have tried running a mailbox repair and done a structural rebuild but it is still happening.

Perhaps I am running gwcheck incorrectly (using standalone version) so if anyone has a definitive guide or link to same please post it. The GW client version on the users workstation is 8.02. They do not have any issue using mail after the error occurs but it would be better to have it corrected in case further corruption of the mailbox happens.