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MailEnable vs grommunio: catalog facts
MailEnable	grommunio
Freemium A free Standard edition, with paid Professional, Enterprise and Premium editions and…	Freemium Open source, with paid plans listed on the pricing page.
Windows, Self-hosted	Linux, Web, Self-hosted
Webmail, IMAP and Exchange ActiveSync for mobile devices CalDAV and CardDAV for calendars and contacts	Native MAPI, EWS and EAS support for Outlook and mobile clients Mail, calendars, chat, video and files on one platform
Windows servers only Collaboration features are in the paid editions	Running a groupware server requires administration skills Some features may depend on paid plans
Downloadable app, Self-hosted	Self-hosted, Hosted service
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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