CRM 4.0 FAQ > Upgrade (3 entries)
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Currently the only supported path for upgrading your customizations would be to use the upgrade process from a CRM3 to to CRM4 Keep in mind it is possible that ...
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No, simply restoring your CRM 3 database and attempting to attach it to CRM 4 will not work - you need to go through the CRM 4 upgrade process
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Mainstream support will end on 4/12/2011 according to the Microsoft site here . Menno has a good post explaining more details here . So if you really like ...
