Outbox Message Stuck after reading some MailItem Properties with VBA

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uflrob

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Outlook version
Outlook 2016 32 bit
Email Account
Exchange Server 2013
HI, Long time reader first time poster.

I've noticed reading almost any mailitem property for any item in the outbox which is queued to be sent (such as a message sent when Outlook is in Offline mode or when a user activates the delayed delivery option) willl remove that item from the queue and those items have to be sent again. So, two questions:

First, which properties can I read without unqueuing the send? I've already found that Subject, Sent, and UnRead can be read, but that I cannot read SentOn, Size and To even though they are displayed in the Explorer.

Second, is there some way that I can read the To, DeferredDeliveryTime or SentOn properties from MAPI that will not cause the queue removal?

I did try resending the item (calling the send method again) but there are sometimes prompts when sending (such as when resending an item that had a delievery delay time which has already passed) that may make that solution unacceptable.
Code:
For Each oItem In Outlook.GetNamespace("MAPI").GetDefaultFolder(olFolderOutbox).Items
    MsgBox "OK to read:" & _
        oItem.Subject & _
        oItem.Sent & _
        oItem.UnRead

    'Reading other properties, necessitates a resend:
    'MsgBox "Not OK to read:" & _
    '    oItem.Recipients.Item(1) & oItem.DeferredDeliveryTime & _
    '    oItem.HTMLBody & oItem.Attachments.count & oItem.EntryID & _
    '    oItem.Body & oItem.To & oItem.SentOn & oItem.Size & _
    '    oItem.ConversationID & oItem.Recipients.count & oItem.Saved
    'oItem.Send
Next
Thanks!
Rob
 
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