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ActiveSync is to Exchange as IMAP/POP3 is to other email providers.

So if you want your email client to speak with an Exchange server you’re using ActiveSync, not other protocols used by other types of servers.

Exchange ActiveSync is a licensed protocol. If any FOSS app handles it for free I’d love to know.

For the most part memes are self contained to their own communities. It takes a few days but you can achieve a relatively meme free experience if you block each community.