Progress of Vaulting users

Hi 

I am quite new to EV and yet have to start vaulting an entire business soon.

If anyone could help with the below that would be great, we have just upgraded to 10.0.4:

• How can you tell how far through the archiving process a mailbox is, you set them off but i have no idea of know where it is upto?
• I'd like to be able to estimate how long it will take to EV a mailbox?
• It is possible to be able to select a mailbox and see how much it will shrink when EV'd?
• We have lots of PST's some old some current any idea how to tell which ones the user's actually have connected to their clients?

Any pointers would help

Thanks

Vicky