Somehow flash VM lost configuration data. Re-entered Number Plans, AA Config, and fixed some PBX Integration parameters. CCRs and Greetings work ok, but calls to extensions not going to VM and extensions cannot access their VM. Mailboxes and passwords look intact. Suggestions what to look for much appreciated.

VM PBX Integration protocol parameters were messed up. I could edit some, but not all of them. Initialized VM and re-entered configuration data. All working now. Nice to know that the greetings are not lost with initialization.

Yes, its nice that greetings are not lost but that holds true for any voice prompts and greetings that you might have modified. Once you change them from default, there is no way to intrinsically restore them back to default after the fact.