grommunio alternative
grommunio or a managed service?
grommunio is software you run yourself or have a partner host. Conbool Mail is a mailbox service run by Conbool, optionally in your own data centre.
- Operation
- By Conbool instead of on your own
- Billing
- Fixed price per mailbox
- Price
- From €1.29 per mailbox per month, net
Conbool Mail and grommunio compared.
| Feature | Conbool Mail | grommunio |
|---|---|---|
| Type | Mailbox service run by Conbool, or operation in your own data centre | Software to run on your own servers, in a private cloud or with a certified partner |
| Licence | Per mailbox in three plans | Open source, plus a commercial subscription for maintenance and manufacturer support |
| Outlook for Windows | Email via IMAP, calendar in webmail | Via MAPI/HTTP |
| Smartphone via Exchange ActiveSync | Yes | Yes |
| Who operates | Conbool in Germany or you in your own data centre | You or a certified partner |
| Vendor | Conbool GmbH, Hamburg | grommunio GmbH, Vienna |
| Price | From €1.29 per mailbox per month, net | See vendor and partners |
Details on grommunio according to the provider's public information, as of October 2026. Plans change, the provider's own information is authoritative. All names mentioned are trademarks of their owners.
grommunio fits when
- Outlook for Windows with calendar and contacts via MAPI is a must.
- you have your own operations team or a partner for it.
- open source is a requirement.
Conbool Mail fits when
- you do not want to run the mailboxes yourself.
- you want a fixed price per mailbox, operation included.
- you want to add spam protection, encryption, signatures and archive in the same portal.
Switching from grommunio to Conbool Mail.
Mailboxes move via IMAP, one by one or as a list from a CSV file. Messages and folders are copied, the addresses stay the same.
Questions about the grommunio alternative
What is the difference between grommunio and Conbool Mail?
grommunio is software that you or a partner run. Conbool Mail is a mailbox service run by Conbool and billed per mailbox.
Does Conbool Mail support Outlook via MAPI?
No. Outlook connects via IMAP and SMTP. Calendar and contacts are available in webmail, on smartphones via ActiveSync and via CalDAV and CardDAV. grommunio states MAPI/HTTP for Outlook.
What does Conbool Mail cost compared with grommunio?
Conbool Mail costs €1.29 for Kiosk, €2.99 for Plan 1 and €5.49 for Plan 2 per mailbox per month, net. grommunio prices are listed in the provider's price list.
Does Conbool Mail also run in our own data centre?
Yes. Conbool Mail can run on your own infrastructure and signs users in through your Active Directory.
Go through the switch with your mailboxes.
We show you Conbool Mail and plan the migration with you.