How to enable or disable POP3, IMAP, MAPI, Outlook Web App or Exchange ActiveSync for a mailbox in Office 365


Enable or disable POP3 for an Exchange Online mailbox

To enable POP3 for a specific user, run the following cmdlet:
Set-CASMailbox <Alias,Primary SMTP, or UPN> -PopEnabled $True
To disable POP3 for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -PopEnabled $False

Enable or disable IMAP for an Exchange Online mailbox

To enable IMAP for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -ImapEnabled $True
To disable IMAP for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -ImapEnabled $False

Enable or disable MAPI for an Exchange Online mailbox 

To enable MAPI for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -MAPIEnabled $True
To disable MAPI for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -MAPIEnabled $False

Enable or disable Outlook Web App for an Exchange Online mailbox

To enable Outlook Web App for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -OWAEnabled $True
To disable Outlook Web App for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -OWAEnabled $False

Enable or disable Exchange ActiveSync for an Exchange Online mailbox

To enable Exchange ActiveSync for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -ActiveSyncEnabled $True
To disable Exchange ActiveSync  for a specific user, run the following cmdlet:
Set-CASMailbox <Alias, Primary SMTP, or UPN> -ActiveSyncEnabled $False

Enable or disable features for all mailboxes in an organization 

To enable or disable any of the features that are listed earlier for all mailboxes in an Exchange Online organization, use the Get-Mailbox command.  For example, to disable POP3 in all mailboxes in an Office 365 organization, use the following command:

Get-Mailbox | Set-CASMailbox –POPEnabled $False

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