My EA agreement expired few months back and with that Forefront Protection for Exchange also got expired.

Now I have renewed EA agreement. 

When I open Forefront Protection for Exchange, I get a message saying, "Enter your license agreement number and license end date." There is also a box to enter these details.

Will this be reactivated if I enter my new EA agreement number and expired date.

Hi,

You may need to contact Microsoft to confirm this.

Here is a article About product licensing.

https://technet.microsoft.com/en-us/library/ee358857.aspx

Best Regards,

Joyce