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Yes it is, you can download all messages in your outlook and use them even when you do not have an internet.
Basm Allah Alrahman Alrahim No link it To Outlook , and Thunderbird , a lot of useful information a bout client email and web mail
look to this link about POP vs IMAP [ both are protocols i.e a way that email deal with messages ]
Look to this link IMAP more secure than POP specially against malware
Which to use web email or client email ?
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