Doing any installs on the BES requires a reboot. This in turn causes the BES to rescan the mailboxes. Until a users mailbox is scanned they will not receive any mail. So yes, there will be a temporary outage. Depending on how many users you have will determine the rescan time. I usually give 30 mins for every 70-100 users, just to be safe.
You should be able to install SP7 ratehr than SP6 then 7. They are cumulative so SP7 has the SP6 updates as well.
I never install SP's one at a time for BES. I just jump to the latest.
Not sure if anyone else here has any thoughts when going to SP7 on BES 4.0.
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