There are many alternatives to Microsoft Office Outlook for Windows if you are looking for a replacement. The best Windows alternative is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Office Outlook and loads of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Microsoft Office Outlook are Mailbird (Paid), eM Client (Freemium), Mailspring (Freemium, Open Source) and Microsoft Mail and Calendar (Free).
TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.
Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.
Take control of your schedule and get reminded wherever and however you want. Instantly access your appointments, tasks, and notes with a simple glance at a transparent calendar that sits right on your Windows desktop.
Collaborative email and threaded group chat for productive teams. A single app for all your internal and external communication. As foreign as chat is to email, mixing them unleashes unforeseen possibilities. Missive is the one app you’ll ever need to manage your work life.