I use Outlook on my PC and ALL my devices (phone, iPad) for all five of my email addresses (personal, business, gmail for Android, and client issued email). I stay connected to everyone all the time. I have used Excel to reconcile differences on tax returns and have actually gotten over $627,000 in IRS penalties and interest abated due to a flawed program that forced the company to submit 18,000 W2s to the IRS. They were required to file electronically and were charged $250 per W2 over 250 (they had three filing entities). The office programs allow me to explain variances, change incorrect tax returns, and save my clients hundreds of thousands of dollars.