Okay so I know this topic can get discussed a lot - but I would like to know what might be best for my Scenario. Brand new Company, we own the domain name ABC.com.
15-20 users in first year - 30 by next
Mail - Provided by Google Apps (no immediate need for Exchange)
No current outside website - we just own domain and provide MX records to our Host email w/Google
Should I go with ad.abc.com for the internal namespace? I have heard of problems with .local and issues with not using 3 letter TLD's
I want to be able to have minimal issues IF we migrate to Exchange and have minimal DNS issues within the domain.