Thunderbird, K-9 Mail, aCalendar, Spark Mail, Mailbird, Apple Mail, Evolution, Mailspring, Postbox, eM Client, Airmail, BusyCal, Cozi, EssentialPIM, Mutt, BlueMail, Windows Live Mail, myMail, Aqua Mail, IncrediMail, FairEmail, Geary, Cron Calendar, Spike, Juicy Mail, Librem Mail, Foxmail, Trojitá, FileOne, Superhuman, DeskTask, Amie, Microsoft Outlook Express, WunderMail, MailMate, ProfiMail, Betterbird, Opera Mail, nPOPuk, Top Task List, One Calendar, Nylas Mail Lives, Me Calendar, Canary Mail, Sunrise Calendar, Desktop Calendar, Inbox by Gmail, Mailpile, When I Work, Microsoft Entourage, Nextcloud Mail, Missive, do-Organizer, Desktop iCalendar, EfficientPIM, Cheddar, Pegasus Mail, Calypso, Orbit Communicator, Polymail, GNOME Contacts, Speaking Email, Hiri, Sylpheed, Atmail Email Server, UKs Kalender, Holiline Reminder, RemindMe desktop calendar, Active Desktop Calendar, Zoho Calendar, Zimbra Desktop, BORG Calendar, Outlook on the Desktop, 30 Boxes, TouchMail, OE Classic, SolMail, SlideMail, Simple Mail, SSuite My Calendar Diary, aerc, Ominder, Koma-Mail, Claws Mail, Open365, Pantheon Mail, Mailbox for Zoho, Astrid, EmailTray, June.ai, CalendarWiz, qOrganizer, Google Calendar Checker, DreamMail, Ymail2, Calbird, Acompli, Clyton, Columba, Milkify, ccToDo To-Do List, Caliander, OrgBusiness Software, Inbox2, Trim Milk, GyazMail, WinMilk, Postler, AutoSnoozer, Kin Calendar, styleNbook, Mailsmith, HipCal, 1calendar, Calvetica, Spicebird, InboxZero, Mulberry, SquareOne, Mail Pilot, AnCal, Xreminder Pro, Email.biz, Mailburn, Smampi, si.Mail, Email Insights for Microsoft Garage, GoGetter, Convenient Calendar, Merge Calendar, PreMinder, Mail Merge, OrgCalendar, Coolendar, Draftboard, Handy Calendar, Polar Liquoo, Visual Calendar for Tablets are some alternatives to Microsoft Office Outlook.