Old topic, I realize, but for reference Office 2007 SP2 broke PST incremental updates via DLO. Something to do with MS changing the whole 3rd-party access mechanism. Last I heard there was no fix.
Sorry for the delay. The job wasn't terribly large - about 3.2 GB. The 99%-to-failure happened every time I tried to backup with "verify" enabled. When I disabled the Verify, the job took the same amount of time, but it actually completed successfu...
This is not just a performance issue - in my case having the "verify" enabled makes the job fail outright after getting to approx. 99% (I tried it a couple of times). I called tech support and was told the failure was a known issue.
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SSE Symantec Endpoint Protection Small Business Edition 12