Rivet compared
Rivet next to Outlook (classic desktop), Thunderbird, eM Client.
Review draft. Competitor cells are unchecked; “To be checked” marks a gap on purpose.
| Rivet | Outlook (classic desktop) | Thunderbird | eM Client | |
|---|---|---|---|---|
| Runs on Linux | Yes | No | Yes | NoFeatures page lists Windows, macOS, iOS, Android only |
| Exchange (EWS) accounts | Yes | Yes | PartlyNative EWS since v145 (Nov 2025): mail only; calendar/contacts were pending | YesSyncs mail, calendar, contacts via Exchange Web Services |
| CalDAV and CardDAV built in | Yes | PartlyMicrosoft states Outlook lacks CalDAV/CardDAV; only via add-ins | YesCalDAV and CardDAV listed as supported on desktop | YesSyncs calendars, contacts, tasks over CalDAV/CardDAV |
| Mail kept locally, searchable, works offline | Yes | Yes | Yes | Yes |
| Calendar and contacts in the same window as mail | Yes | Yes | PartlyCalendar built in; contacts via address book | Yes |
| Full-text search that covers attachments | Yes | Yes | NoNo search inside attachment text (PDF etc.); add-ons do not index it | YesSearch covers attachments; needs the attachment-search option on |
| Server-side rules (Sieve) as well as client rules | Yes | NoNo Sieve in Exchange/Outlook; Exchange inbox rules do run server-side but are not Sieve | NoSieve/ManageSieve not in Thunderbird's standards table; add-ons only | NoServer-side rules only for Exchange, IceWarp, Gmail; Sieve not documented |
| Outlook PST import | Yes | YesClassic Outlook imports mail, contacts, calendar from .pst | To be checked | YesImports MBOX, PST or EML files |
| S/MIME and OpenPGP | PartlyBuilt | PartlyS/MIME supported; OpenPGP not documented | YesBoth built in: S/MIME and OpenPGP (CORRECTION: was partial) | YesSign and encrypt with S/MIME or PGP |
| Telegram inside the mail client | PartlyNative view, still being tested | No | No | No |
| WhatsApp, Slack and Discord panels | PartlyThe services' own web apps in a frame | No | No | PartlyChat services as panels |
| Browse and share IronDrive files from the client | Yes | PartlyOneDrive and SharePoint only | No | No |
| Updates itself from signed releases | Yes | Yes | Yes | Yes |
| macOS | YesApple silicon, signed and notarised build; Intel Macs and in-app updates on Mac not yet | Yes | Yes | YesmacOS listed as supported platform |