MS Exchange Client-Server protocols

Just came across this simple diagram of MS Exchange client-server protocols and figured I’d share it here. These days there is a bit of a confusion on where each protocol used in Exchange so I decided to try and fill this gap. I will also put it in the context of QMM migrations and describe  how it evolved over the years plus point out a difference in permissions assignment model.

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Another tough case of MAPI_E_FAILONEPROVIDER mailbox access error

This case is another one of those countless issues which reminds you every day that no matter how long you have been doing migrations you can never rest on an old knowledge and experience. Rather you need to keep learning something new which may at first appear same old, that’s a nature of our job 🙂

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