exchange365 hybrid information

1) If your exchange setup is based on a hybrid (i.e. part cloud hosting of mailboxes, part internal hosting of mailboxes), for the internal hosted mailbox servers do you still require some form of spam/virus filter for inbound emails at your network permiter?

2) Also, is office365 used purely as the client for the exchange365/online mailboxes, or do/can you also use office365 for the mailboxes hosted on your on-premise servers? Or is it more common to use the traditional client version of outlook?

3) How does authentication to exchange365/online mailboxes work? Is it integrated with your internal AD credentials? Or is there a separate login process?
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pma111Asked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
1. Yes always a good idea
2. O365 consists of 2 components - office 2013 client on client machines and Exchange Online, Sharepoint Online, Lync Online server components which resides in the cloud. The clients have no restrictions other than once a month their subscription status is checked.
3. It can be using Azure AD, ADFS, but not required
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