Fixed: Public folder favorites weren't syncing in Outlook 2016.
Use Retention Tags to archive messages, then delete them from the archive at a later date.
Monitor employees suspected of sending confidential information and/or attachments outside the domain & then constantly purging deleted items recovery.
If you're using batch migration or serial migration to migrate public folders from Exchange Server 2007 or 2010 to Exchange Server 2013, 2016, or Exchange Online, data loss may occur if all of your folders' replicas aren't on the primary database (the primary database server which the migration service connects to).
The Spring 2016 quarterly updates for Exchange Server are now available on the Microsoft Download Center.
How to add addresses to Outlook's Safe Sender and Blocked senders lists individually or using group policy. Use allowed and blocked lists on Exchange server to bypass filtering or block addresses.
Users connecting to Exchange 2007 mailboxes should not upgrade to Office 2016 as you cannot connect Outlook 2016 to Exchange 2007 using Exchange services. If you only need email, you can use IMAP, provided IMAP support is enabled on the server.
The problem: You have a shared mailbox in your profile and Send as permission on the mailbox. When you send a message from the shared mailbox, the sent message goes into your own Sent Items folder. By default, sent messages are stored in your own mailbox, not the shared mailbox and the DelegateSentItemsStyle registry value
Office 365 tenants with First Release enabled are beginning to see the new Outlook on the Web features, while the remaining tenants will see the updates beginning in early September. Outlook.com users who have been migrated to Office 365 have the new Outlook on the Web features now. As a first order of business Outlook
Remove fields from the Address Book view of the Global Address Book (GAL) in Outlook 2007 - 2013.