You want to secure one main domain, but you also have several subdomains? If so, then the Sectigo Wildcard SSL certificate is what you need. With just one certificate, you can cover your main domain (www.domain.com) and as many subdomains as you need (owa.domain.com, autodiscover.domain.com, etc.). Being a Domain Validated (DV) certificate, the Sectigo Wildcard SSL can be issued in minutes. It is the most economical Wildcard product from the most famous Certificate Authority.