[THIN] XenApp 4.5 upgrade query

Hi

Im looking at upgrading my farm from Windows 2003 CPS 4.0 to Windows 2003 XenApp 4.5.  We run Web Interface 4.2 with an old version of Citrix License Server.  I will be upgrading the License Server to the latest so there should be no issues here.  My queries are:

1) Will Web Interface need to be updated to the latest version for XenApp 4.5 to work or is WI 4.2 OK?

2) Will there be any issues if I do an inplace upgrade to XenApp 4.5 in the same farm and slowly upgrade?  Therefore the farm will have a mix of 4.0 and 4.5 servers for up to 2 weeks.

3) Is it preferable to build new servers with XenApp 4.5 in the same farm (in seperate zones) and slowly port the applications/users across (there still would be a mix of 4.0 and 4.5 in the same farm only the installs would be clean)?

Any guides/best practices on upgrading would be appreciated.

Thanks
Angela

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