Upgrading BE2010 R2 to R3
I would like to upgrade my BE2010 R2 to R3 SP3 in order to backup the exchange 2010 SP3.
And I have downloaded the R3 iso image. During the installation, I need to enter a license ID.
But the question is which ID should I enter? I cannot use the one used in installing BE2010 R2 i.e. the license ID of existing BE.