BlueMail supports GAL (Global Address List) for Exchange.
GAL is integrated into our Auto-Complete feature. When composing an email, simply begin typing the recipient's email address into the *To* field and our Auto-Complete/GAL feature will kick in. Our App will suggest a list of relevant addresses from contacts you have sent emails to, in addition to contacts integrated from your device's default Address book / contacts application. If your account is an Exchange ActiveSync account that supports GAL, your GAL addresses will be displayed as well.
To view the list of your device contacts, you can also tap the "*+*" icon in the compose view, which will display your email and device contacts. Device contacts have the Device icon next to the contact's name.