Open source mail archiving solution

Any opensource mail archiving solutions that can use for o365 mail users .

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Not open source, but I think Synology's 365 backup is one of the better ones you can get – all you need is a compatible Synology NAS.

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but this is for backup . can it do the archiving process ( based on dates ) to free up space of mailbox

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No. Do you have users who are exhausting the online archiving functionality in M365? That would indicate an extreme email workflow problem.

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yes - your right .

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What licensing do you have? How many users?

Likely any solution here, even open source, is going to be more problematic and costly than just buying the next tier license.

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I personally would use because of it's advanced secuirties and free features. https://www.mailpiler.org/features

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https://mail-archiver.org/