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

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