I am having some problem with the archive option in Outlook. My mailbox is almost full and I am archiving all the emails which are one year old. But, archiving is also taking up space.

Do you know what could be the issue?


  • You could try emailing yourself a 50 Mb attachment from another account. Once it comes in, archive it and see how much space it takes. It's likely that archiving keeps attachments at their original size. – jonsca Oct 10 '18 at 1:54

Export your mail to file and then delete archived mail. Archiving mail is not the same as deleting, it only means to move mail from your main inbox.

Edit: I am not sure about web app, but for example if you use Outlook for desktop you will find theese options under file - export / import

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