what the issues facing with data migration in Dynamics CRM

the issue is not of dynamics. Migrating classic ASP wesite

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the migration is from IIS 6 (windows server 2003) to IIS 8(windows server 2012).

I have done the configuration same as IIS 6, but the website is giving error on browsing.

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Only someone who has done migration can say what issue he/she faced.

But for "best practices" or recommended approch, things to keep in mind, etc. you can refer below links on microsoft:

https://technet.microsoft.com/en-us/library/hh699673.aspx

https://technet.microsoft.com/en-us/library/hh699716.aspx

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When the migration is going between MSCRM 2013 to MSCRM 2016 What are issues we will face???

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please ask properly

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