If you need to replace a trial or "expired" key with a genuine one:
Using unauthorized or pirated activation keys can lead to several issues, including: microsoft 2013 activation key
There are two types of activation keys:
An activation key is required to:
If you already purchased a retail copy of Office 2013, your 25-character product key (e.g., XXXXX-XXXXX-XXXXX-XXXXX-XXXXX) can still be used for activation via phone or online, though Microsoft’s activation servers may eventually be retired. If you need to replace a trial or