MailStore: archiving email the way the law requires
In Switzerland, business-relevant emails must be kept for ten years, unaltered and retrievable at any time. MailStore archives all messages automatically and makes them searchable in seconds. We set up the archive and monitor it.
What is MailStore?
MailStore Server is email archiving software from Germany. It copies all incoming and outgoing messages into a separate archive, independent of the mail server. The archive stays complete even if someone deletes messages in their mailbox.
At a glance
- Archives Exchange, Microsoft 365, Zimbra and IMAP
- Stored tamper-proof, with checksums
- Full-text search across all messages and attachments
- Access from Outlook or the browser
- Runs in your own network, data stays in Switzerland
Why an archive and not a backup
Meet retention duties
The Swiss Code of Obligations and the Ordinance on Business Records require business correspondence to be kept unaltered for ten years. A backup does not meet this.
Nothing gets lost
Deleted messages remain in the archive. This protects against accidental deletion and tampering.
Found in seconds
Full-text search finds every message and attachment across years, including those of former staff.
Leaner mailboxes
Old messages can be removed from mailboxes and remain in the archive. Mail server and backup get faster.
What we take care of
Setup, import of existing data and ongoing checks.
- 1
Setup
Installation on your server or in our infrastructure in Switzerland, connected to your mail server.
- 2
Import existing data
Existing mailboxes and PST files are imported so the archive has no gaps.
- 3
Define rules
Retention periods, access rights and deletion rules according to your needs and the law.
- 4
Monitoring
We regularly check that archiving runs and that the archive is backed up with Proxmox Backup Server.
Who MailStore is right for
- Every company with retention duties under Swiss law
- Fiduciaries, lawyers and audited companies
- SMEs on Microsoft 365 that want an independent archive outside the cloud
- Businesses changing mail servers that need to keep old messages
Frequently asked questions
Your question is not listed? Ask us directly.
Isn’t our backup enough?
No. A backup keeps the current state and is overwritten after some time. An archive keeps every message unaltered for the legal period.
Does MailStore work with Microsoft 365?
Yes. MailStore archives Microsoft 365, Exchange, Zimbra and other mail servers via standard interfaces.
Can staff search themselves?
Yes, within their own archive depending on permissions. Search works in Outlook or the browser.
Where is the archived data stored?
On your server or in our infrastructure in Switzerland. The archive is backed up as well.
Related insights
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- EmailNew Microsoft 365 clause: who decides about your email?Since 1 November 2026, Microsoft may pass certain Microsoft 365 content to a US reporting centre. What the clause means and when self-operated Zimbra is the better choice.Read
Let’s talk about MailStore.
Tell us what's bothering you. We listen, look at your situation and tell you honestly what makes sense.