IP Office isn't bad to learn. When it comes to the advanced aps (CCC, IMS) you'll have fun banging your head against the wall the first time unless you have somebody showing you what to do.
IP Office loads aps on Severs unlike BCM/Norstar, so if you are coming from that arena you may have less experience with servers/domain accounts. It is helpfull to be savvy with servers.
I always like to mess around with a unit as much as i can before i go to training, then i get the chance to ask all or some of the true questions that i may need to know.
Normally you just go to training, get out on your first install and say "Oh %#@#" how do i do that!!!!
Remember to upgrade DS30 modules to 3_2_99 loader first per docs, i almost missed that one the first time.
Here is question you will want to make sure you get answered. When an employee leaves, how do you change the mailbox to the new employee? If you just change the name in Manager, it overwrites the files in Voicemial PRO but sometimes leave old greetings behind. The long way is to go into Voicemail PRO and delte the 3 files in Accounts/Greetings/Names. Any other takers...