upgrade my domino server 8.0.1 to 8.5.2

I want to upgrade my domino server to 8.5.2 from 8.0.1. I have a mix of lotus clients from version 7 to 8.0.1. Some of the mail database templates are still mail7.ntf. What should be step by step guide to upgrade the server. What are the precaution need to be taken.
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as well as the redbooks for upgrade and deployment.

I hope this helps !

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I think the best documentation is here:


Here you´ll see important information about what to migrate first and what the supported configurations. I think that migrating 8.0.1 to 8.5.2.x will be easyer.

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