Actually the number may or may not be accurate. If you see the licensing guide (or read that forum post), Enterprise Vault mailbox archiving is licensed per user, not per archive or mailbox. The number you will have obtained there is the number of mailboxes which are currently enabled for archiving and have a policy applied. Group mailboxes and resource mailboxes (if you are archiving these) would therefore be counted in the query you have just run, but would not count towards your license total.

So, if you know how many non-user mailboxes are being archived, then remove this from the total above and you should have your answer. If there is an easy way of identifying these (i.e they are all in a particular provisioning group, or are all 'hidden' or all have disabled accounts) then the query may be modified to work in your particular instance.

EV will not disable itself if you go over your license count for mailbox archiving though.

Regards,

Jeff