We have several lists in our WSS 3.0 environment where NewForm.aspx, EditForm.aspx and DisplayForm.aspx are customized via SharePoint Designer 2007. Now we plan to upgrade to SharePoint Foundation 2010 and are unsure how that customization will behave during migration? We did not create a new form (like NewForm_custom.aspx) but modified the existing one.
From my understanding the customized forms is stored in the content DB which will be upgraded -so everything will work and look the same after migration?!
(Yeah, I know, pretty unrealistic. So who what's to tell me what we are going to face and what the best pratices here are?)