These days, Microsoft Office 365 (for business) from the start if you need an entire office in a box. Fastmail if you just need email, CalDAV, CardDAV, and lig

These days, Microsoft Office 365 (for business) from the start if you need an entire office in a box. Fastmail if you just need email, CalDAV, CardDAV, and light WebDAV. I use (and/or administer) both daily and like them for different reasons.