Hi there, have you heard of exchange alternative? There was no real exchange alternative although microsoft has opened MAPI specification over ten years. No one implemeneted the real native MAPI protocol, even the openchange. Now I have finished this work
and bring it to the open source world. It's 100% compatible with microsoft outlook and much more powerful than Exchange. one VPS with only 1 CPU can support 500 users. If anyone has interests in the system, please visit the github and search STEEP_SYSTEM.
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