Despite the age of the protocols, you can cheerfully connect a wide range of IMAP4 and POP3 clients to Exchange Online. If you do, you might need to consider how to handle calendar appointments, and if you want to use iCAL, you’ll need to make some adjustments with PowerShell.
Exchange Online supports inactive mailboxes as a way to keep mailbox data online after Office 365 accounts are removed. Inactive mailboxes are available as long as a hold exists on them. You can update mailbox properties to exclude all or some org-wide holds. If you exclude holds from a mailbox, you run the risk that Exchange will permanently remove the mailbox. If that’s what you want, all is well, but if it’s not, then you might not be so happy.
Microsoft announced a new migration experience from Google G Suite yesterday, which is nice. Under the covers, the venerable Mailbox Migration Service (MRS) does the work to extract mailbox data from Gmail using IMAP4 and moves it to Exchange Online. But after the move is done, there’s still lots of work to do to help users make the cultural change to their new mailbox in the cloud.
The Office 365 Admin Center offers the option to bulk-create user accounts. Loading up a CSV file with details and having it processed is simple enough, but the resulting accounts need some work before they are fit for purpose and ready for people to use. Here’s how the bulk creation process works and why we think it has some flaws.
Some backup vendors think that corruption can lead to data loss within Office 365. The possibility exists, but the page patching mechanism for databases incorporated into Exchange Online DAGs makes corruption a lot less likely, especially when mailboxes are protected by four database copies and Exchange applies many other techniques to ensure the consistency of the databases.