Pricing
Pay once.
Use indefinitely.
A perpetual licence per server, tiered by user count. No access licences, no annual renewal, no price changes during operation.
For IT service providers and system houses →
Introductory offer v1.0: Half price until November 30, 2026. Whoever joins now keeps that price permanently, and the introductory price also includes all updates up to version 2.0 — including the ones that move beyond v1.0.
The introductory price ends on November 30, 2026.
The introductory price is a limited-time offer. Whoever buys at it keeps it permanently; the shipped version is listed in the download area.
Promotion code from our letter? Enter it in the field for promotion codes at the payment step. It applies to the first licence.
Try it first: 14 days, no registration and no payment details. AnnexGroup runs as a server on Linux and macOS, not on Windows. Try for 14 days
Small
up to 10 users
€245 €490
one-time, net of VAT
€291.55 gross at 19 % VAT
For small teams and single locations.
Includes 5 AnnexOffice seats. See AnnexOffice (at AnnexCREATE)
Standard
up to 25 users
€495 €990
one-time, net of VAT
€589.05 gross at 19 % VAT
The usual fit for a mid-sized office.
Includes 10 AnnexOffice seats. See AnnexOffice (at AnnexCREATE)
Medium
up to 50 users
€845 €1,690
one-time, net of VAT
€1,005.55 gross at 19 % VAT
For offices that have outgrown Standard.
Includes 15 AnnexOffice seats. See AnnexOffice (at AnnexCREATE)
Large
up to 100 users
€1,245 €2,490
one-time, net of VAT
€1,481.55 gross at 19 % VAT
Several departments or locations on one server.
Includes 25 AnnexOffice seats. See AnnexOffice (at AnnexCREATE)
Very large
up to 250 users
€2,450 €4,900
one-time, net of VAT
€2,915.50 gross at 19 % VAT
For large organisations. One licence per server, no access licences.
Includes 50 AnnexOffice seats. See AnnexOffice (at AnnexCREATE)
Payment via Stripe — card, PayPal, Klarna, SEPA direct debit and others; the checkout shows which. Invoice with itemised VAT included; you can enter your VAT ID at checkout. The licence arrives by e-mail as soon as the payment has cleared — immediately with card and PayPal, and with direct debit as soon as the bank confirms it.
Included in every licence
- All features, no add-on modules
- Updates of major version 1.x
- Operation on one server, unlimited domains
- No running costs
What that means in comparison
Calculated for an office with 25 workplaces over three years. We compare against other groupware servers you run yourself first — the cloud suites come last, because they contain more than a mail server:
| Solution | Cost over 3 years | Note |
|---|---|---|
| grommunio Subscription | approx. €1,790 | from €1.99 per mailbox and month; a subscription that keeps running as long as you run the server |
| Kerio Connect | approx. €1,400 | Annual licence |
| Zimbra Network Edition | on request | no public list price; the price is set per quote |
| AnnexGroup v1.0 | €495 | one-time; in year four still €0 |
| Microsoft 365 or Google Workspace | approx. €12,600 | $14 per user and month each. Not the same product: those include Office applications such as Word, Excel and Teams, which AnnexGroup does not provide |
All amounts net. For the subscription models, calculated without the price increases to be expected in this period. Your own operating costs are not included in any case — with AnnexGroup you run the server yourself.
Feature comparison
The same five products, the same number of users. Three marks are enough — yes, no, with limitations. What a vendor does not document publicly is marked as such, not guessed.
| Feature | AnnexGroup Standard | Kerio Connect | grommunio | mailcow | Microsoft 365 Business Standard |
|---|---|---|---|---|---|
| Pricing model | One-time purchase | Subscription | Subscription | Free | Subscription |
| Cost for 25 seats over 3 years | €495¹ | not publicly documented | €1,791.00⁵ | €0⁷ | €10,917.00⁶ |
| Runs on macOS | yes | yes | no | no | no |
| Runs on Linux | yes | yes | yes | yes | no |
| Switching from Exchange included | Yes, entirely in the server: mailboxes through the wizard, calendars, contacts and tasks in the same run via EWS or Microsoft Graph. No Mac needed. The Graph path is covered by tests — not tried against a real Exchange Online mailbox. | yes | yes | no | yes |
| IMAP with CONDSTORE and QRESYNC | yes | not publicly documented | not publicly documented | yes | not publicly documented |
| CalDAV and CardDAV | yes | yes | yes | yes | no |
| Server-side full-text search | yes | yes | yes | yes | yes |
| AI agents on the server | yes | with limitations² | with limitations³ | no | with limitations⁴ |
| Outlook without add-on software (MAPI, EWS, ActiveSync) | no | yes | yes | no | yes |
| Office applications (word processing, spreadsheets, video conferencing) | no | no | yes | no | yes |
| Open source | no | no | yes | yes | no |
- Introductory price — €990 regular, permanently valid for purchases by 30 November 2026 inclusive.
- Kerio Connect AI: summaries and draft replies, on-premises — assistive, no self-acting agents.
- grommunio AI: assistant since June 2026, the model can run locally — no self-acting agents.
- Microsoft 365 Copilot: paid add-on, processed in the vendor's cloud.
- List price Basic from 6 users; subscriptions per user and month.
- €12.13 per user and month, annual subscription billed yearly, excluding VAT.
- Community edition under GPL; costs only for running it yourself.
Sources for third-party information
- Kerio Connect (GFI): https://www.gfi.ai/products-and-solutions/email-and-messaging-solutions/kerioconnect and https://manuals.gfi.com, retrieved 03.09.2026
- grommunio: https://grommunio.com/pricing and https://docs.grommunio.com, retrieved 03.09.2026
- mailcow: https://docs.mailcow.email and https://github.com/mailcow/mailcow-dockerized, retrieved 03.09.2026
- Microsoft 365: https://www.microsoft.com/de-de/microsoft-365/business/microsoft-365-business-standard and https://learn.microsoft.com, retrieved 03.09.2026
For IT service providers and system houses
From the second licence onwards we grant a 25 % partner discount. The partner terms do not apply to the first licence; a promotion code from a letter, however, applies to the first licence.
The partner buys on his own account and invoices his customer himself. We settle with the partner, not with his customer.
There is no tier beyond this level — one level, done. Anyone who maintains several customer environments is exactly the right contact.
Frequent questions about pricing
What happens at version 2.0?
With a purchase at the regular price, all updates up to and including version 1.x are included — permanently. The jump to 2.0 will be priced separately. Purchases at the introductory price — by 30 November 2026 inclusive — additionally include all updates up to and including version 2.0. Your licence does not expire in the process: you can keep working on your version indefinitely.
What if we hire more people?
You move to the next tier and pay the difference. Your data stays where it is — only a new licence file is installed.
Can we test first?
14 days with the full feature set, without registration and without payment details. If the trial expires without a decision, mail reception stays active — no messages are lost. Sending and administration are locked until a licence is installed.
Doesn’t resale contradict §3 of the terms?
No. §3 requires a separate agreement — and that is exactly what the partner conditions on this page are: anyone who buys on their own account and invoices their own customer is acting within these conditions. Anything beyond that — subletting, providing a service to third parties without buying a licence — remains subject to a separate arrangement.
Still unsure?
Tell us what you work with today and how many mailboxes it is. We will tell you honestly whether AnnexGroup fits — even if the answer is no.