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Outlook Google Calendar Sync vs DavMail: catalog facts
Outlook Google Calendar Sync	DavMail
Free Free and open source under MPL-2.0, supported by donations.	Free Free and open source under the GPL-2.0 licence, with optional donations.
Windows	Windows, macOS, Linux, Self-hosted
Syncs attendees, reminders and descriptions Portable version needs no installation	Covers mail, calendar, contacts and directory in one gateway Works with on-premises Exchange and Exchange Online
Windows only and needs desktop Outlook Requires a Google account	Requires configuring each client to use the gateway Java application rather than a native interface
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: MPL-2.0	License: GPL-2.0
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.