We have exchange 5.5 SP3 running on 2 servers in our domain. One server hosts the user mailboxes (75 approx), the other hosts the IMC. This has been very stable for almost a year, but recently in the pst 2 days all users have been unable to open any attachments and messages with attachments sent to the internet are returned. Messages with attachments sent to users inside the domain are received but attachments still cannot be opened. All users have OL2000 clinets. We have done the usual with eseutil/isinteg (many times now) but nothing has changed at all. Any suggestions welcomed.
