We have an NT4/exchange 5.5 client backing up to a solaris veritas
bussiness server 4.5 with MP5 (patched on client too). OTM is on with
default settings.

When first installed the client hung about 10 minutes into backup. A few
days latter we tried again - no problems (while a sat there and waited).
Now the problem has resurfaced. For a month or two things went smoothly.
We did change the account that the backup client runs as (trying to get
mailbox backups working)

We sucessfully did an exchange data base full backup, since the problem
reappeard. We have mailbox level backups also configured (but not currently
working - I dont  think this is part of the problem and Im pretty sure
mailbox leve wasnt configured the first time the problem appeard).

Ive got a sneeking suspicion about OTM, but we have nothing in any log
files.

has anybody seen nbu-4.5 do this to an NT system?

Thanks