>why  the  accounts could be restored but the stored mail could not be
>restored.

Because  they  had  a  userbase  backup (it can be stored in the local
registry, but was more likely in a remote SQL database), but no backup
of  the  actual  mailbox  directories, which are stored locally on the
server.

>if  anyone  could offer some explanation or insight into what kind of
>cataclysmic meltdown could have occurred on this server

They  might  have had non-redundant disk storage (a no-no) and blown a
hard  drive;  perhaps  lost  an array controller which for some reason
they  could  not  replace, thus denying them access to the data on the
drives  even though it was basically intact; or experienced some other
kind of array-wide corruption.

> why  the accounts could be restored but the stored mail could not be
> restored

Because  they  weren't  backing  up  your mailboxes at all, or weren't
verifying their backups appropriately and had a bunch of useless DLTs,
thus  forcing  them  to  start  from  scratch.  This is the only real,
preventable  area.  I  can't  pass  judgment  on them, not knowing the
inside story, but I would always have at least a cold-spare server and
a  known-good backup on hand for such circumstances. (Of course, there
are  many  higher levels of fault tolerance, such as clustering, which
could  also have been put in place, but those aren't obligatory unless
an SLA says they're in there.)

Sandy


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