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The default is to use the best format based on the message. Sets the preferred format for received messages. PopMessagesRetrievalMimeFormat ImapMessagesRetrievalMimeFormat
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$true: POP3 or IMAP4 users that use the send read receipt for messages I send option in their email client programs receive a read receipt only when the recipient opens the message. Users are also sent a read receipt when the user opens the message. $false: POP3 or IMAP4 users are sent a read receipt each time a recipient downloads a message. You can change it so that only one read receipt is sent: when the user opens the message. Sets whether to send read receipts when a message is downloaded and again when it is opened or just when the message is opened By default, if a read receipt is requested, two read receipts are sent: one when a user downloads a message and another when the user opens the message. PopSuppressReadReceipt ImapSuppressReadReceipt $true: Meeting requests are all Outlook on the web links $false: Meeting requests are all iCal format By default, meeting requests appear as Outlook on the web (formerly known as Outlook Web App) links. Sets the preferred format for meeting requests. PopForceICalForCalendarRetrievalOption ImapForceICalForCalendarRetrievalOption The configuration options are described in the following table. You use the Set-CASMailbox cmdlet to configure the PO3 and IMAP4 options for each user.