I am an web programmer of an organization. Currently we are having windows Sever 2003 with IIS 6.0 installed in our dedicated server. We have used java script, vb script and asp in our website source code.
The database structure of our website is poor and the datatypes of the fields of tables are not proper. We are currently using SQL Server 2005 express edition for database.The database structure is almost 10 years old and no referential integrity is maintained in the database. We are continuing with the same old database structure as to restructure the database the whole source code also need to be modified and our SEO part will also be affected.

We are going to upgrade our server configuration and our new server will be having Windows Server 2008 with IIS 7.0 in it. We will use SQL Server 2008 R2 web edition for database.

Can anyone please tell me will there be any issue while transfering the codes from old server to new server?
Certainly we need to change the coding for connection string with new data source, user name and password where the asp codes will connect to SQL server. But will there be any other issue related to asp coding? As, this is the first time I am handling with the upgradation to new server, please help me out in this matter.

Thank you all in advance.