I have one user who periodically gets a d107, or several, when opening attachments. If he acknowledges the error and retries a few seconds later he can successfully retrieve the attachment. The environment is as follows:

GW 8 HP1
OES2 Linux
~500 users
Message store hosted on a Dell 2950 with 6 drives in a RAID 5 array, 15k RPM drives

K. Davis