Office 365 Outlook - mark to download

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Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
Under 'Send/Receive' there is an item 'Mark to Download'
I wonder what it does.
Have not tried it - vainly searched for info on this.

As opposed to POP3 there is no 'Leave on server for xx days'.

I always want to keep all my mails. For me that is important. I used to save mails in archive PST files and can go back many years.

When using IMAP (or Exchange) I believe the mail isn't actually downloaded, like when using POP3.

If one time in future I wish to archive the IMAP mails, how am I then to proceed?
(If at all possible, of course)


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