All Exchange 2007 servers in the organization must have Exchange 2007 SP3 or later installed. The following servers don't meet this requirement

Hi Everyone,

I am trying to install exchange 2013 and I'm running in to an issue. I am not an exchange expert, however I can understand the error message. 

I see that exchange 2007 must be have SP3 but the funny thing is that all the exchange servers in the organization were decommissioned.

This is the error message,

Error:

All Exchange 2007 servers in the organization must have Exchange 2007 SP3 or later installed. The following servers don't meet this requirement: xxexx,exchxx,exchxzx

For more information, visit: 

If there is anything I can do to check why this error message pops up.

(or)

If there is any entry that remains even after exchange is decommissioned causes this error message to pop up?

Appreciate your input and time.

Thanks,

Sathish_Phoenix